xml dom etree

20 files changed, 6475 insertions, 5 deletions

diff --git a/modules/language/python/compile.scm b/modules/language/python/compile.scm
index 503a1d8..b4ba58f 100644
--- a/modules/language/python/compile.scm
+++ b/modules/language/python/compile.scm
@@ -1750,7 +1750,10 @@
          (a= (get-args=  vs v))
          (a* (get-args*  vs v))
          (** (get-args** vs v)))         
-     (list (C `lam) `(,@as ,@a* ,@a= ,@**) (exp vs e)))))
+     (list (C `lam) `(,@as ,@a* ,@a= ,@**) (exp vs e))))
+  
+  ((_ () e)
+     (list (C `lam) `() (exp vs e))))
  
  (#:stmt
   ((_ l)
diff --git a/modules/language/python/exceptions.scm b/modules/language/python/exceptions.scm
index c1cad19..fd1f0e1 100644
--- a/modules/language/python/exceptions.scm
+++ b/modules/language/python/exceptions.scm
@@ -21,7 +21,8 @@
 			  EnvironmentError ConnectionError NotADirectoryError
                           ConnectionResetError ChildProcessError TimeOutError
                           BrokenPipeError ConnectionAbortedError SystemExit
-                          ConnectionRefusedError ArithmeticError))
+                          ConnectionRefusedError ArithmeticError
+                          FutureWarning))
 
 (define-syntax-rule (aif it p x y) (let ((it p)) (if it x y)))
 
@@ -169,3 +170,4 @@
 (define-wr UserWarning               'UserWarning)
 (define-wr PendingDeprecationWarning 'PendingDeprecationWarning)
 (define-wr RuntimeWarning            'RuntimeWarning)
+(define-wr FutureWarning             'FutureWarning)
diff --git a/modules/language/python/module.scm b/modules/language/python/module.scm
index eff20f0..49a4366 100644
--- a/modules/language/python/module.scm
+++ b/modules/language/python/module.scm
@@ -54,7 +54,9 @@
     (lambda (self id pre l nm skip-error?)
       (if id
 	  (aif it (rawref self id)
-	       ((ref it '__init__) pre l nm)
+	       (begin
+                 ((ref it '__init__) pre l nm))
+                 
 	       (begin
 		 (rawset self id (Module pre l nm))
 		 (_make self pre nm skip-error?)))
@@ -64,8 +66,10 @@
                    (begin
                      ((rawref it '__init__) pre l nm)
                      it)
-                   (_make self pre nm skip-error?))
-               (_make self pre nm skip-error?)))))
+                   (begin
+                     (_make self pre nm skip-error?)))
+               (begin
+                 (_make self pre nm skip-error?))))))
 
   (define _contupdate
     (lambda (self id pre l nm)
diff --git a/modules/language/python/module/xml.py b/modules/language/python/module/xml.py
new file mode 100644
index 0000000..dff4c51
--- /dev/null
+++ b/modules/language/python/module/xml.py
@@ -0,0 +1,27 @@
+module(xml)
+
+"""Core XML support for Python.
+
+This package contains four sub-packages:
+
+dom -- The W3C Document Object Model.  This supports DOM Level 1 +
+       Namespaces.
+
+parsers -- Python wrappers for XML parsers (currently only supports Expat).
+
+sax -- The Simple API for XML, developed by XML-Dev, led by David
+       Megginson and ported to Python by Lars Marius Garshol.  This
+       supports the SAX 2 API.
+
+etree -- The ElementTree XML library.  This is a subset of the full
+       ElementTree XML release.
+
+"""
+
+
+__all__ = ["dom", "parsers", "sax", "etree"]
+
+import xml.dom     as dom
+import xml.parsers as parsers
+import xml.sax     as sax
+import xml.etree   as etree
diff --git a/modules/language/python/module/xml/dom.py b/modules/language/python/module/xml/dom.py
new file mode 100644
index 0000000..a48e61d
--- /dev/null
+++ b/modules/language/python/module/xml/dom.py
@@ -0,0 +1,144 @@
+module(xml,dom)
+
+
+"""W3C Document Object Model implementation for Python.
+
+The Python mapping of the Document Object Model is documented in the
+Python Library Reference in the section on the xml.dom package.
+
+This package contains the following modules:
+
+minidom -- A simple implementation of the Level 1 DOM with namespace
+           support added (based on the Level 2 specification) and other
+           minor Level 2 functionality.
+
+pulldom -- DOM builder supporting on-demand tree-building for selected
+           subtrees of the document.
+
+"""
+
+class Node:
+    """Class giving the NodeType constants."""
+    __slots__ = ()
+
+    # DOM implementations may use this as a base class for their own
+    # Node implementations.  If they don't, the constants defined here
+    # should still be used as the canonical definitions as they match
+    # the values given in the W3C recommendation.  Client code can
+    # safely refer to these values in all tests of Node.nodeType
+    # values.
+
+    ELEMENT_NODE                = 1
+    ATTRIBUTE_NODE              = 2
+    TEXT_NODE                   = 3
+    CDATA_SECTION_NODE          = 4
+    ENTITY_REFERENCE_NODE       = 5
+    ENTITY_NODE                 = 6
+    PROCESSING_INSTRUCTION_NODE = 7
+    COMMENT_NODE                = 8
+    DOCUMENT_NODE               = 9
+    DOCUMENT_TYPE_NODE          = 10
+    DOCUMENT_FRAGMENT_NODE      = 11
+    NOTATION_NODE               = 12
+
+#ExceptionCode
+INDEX_SIZE_ERR                 = 1
+DOMSTRING_SIZE_ERR             = 2
+HIERARCHY_REQUEST_ERR          = 3
+WRONG_DOCUMENT_ERR             = 4
+INVALID_CHARACTER_ERR          = 5
+NO_DATA_ALLOWED_ERR            = 6
+NO_MODIFICATION_ALLOWED_ERR    = 7
+NOT_FOUND_ERR                  = 8
+NOT_SUPPORTED_ERR              = 9
+INUSE_ATTRIBUTE_ERR            = 10
+INVALID_STATE_ERR              = 11
+SYNTAX_ERR                     = 12
+INVALID_MODIFICATION_ERR       = 13
+NAMESPACE_ERR                  = 14
+INVALID_ACCESS_ERR             = 15
+VALIDATION_ERR                 = 16
+
+
+class DOMException(Exception):
+    """Abstract base class for DOM exceptions.
+    Exceptions with specific codes are specializations of this class."""
+
+    def __init__(self, *args, **kw):
+        if self.__class__ is DOMException:
+            raise RuntimeError(
+                "DOMException should not be instantiated directly")
+        Exception.__init__(self, *args, **kw)
+
+    def _get_code(self):
+        return self.code
+
+class IndexSizeErr(DOMException):
+    code = INDEX_SIZE_ERR
+
+class DomstringSizeErr(DOMException):
+    code = DOMSTRING_SIZE_ERR
+
+class HierarchyRequestErr(DOMException):
+    code = HIERARCHY_REQUEST_ERR
+
+class WrongDocumentErr(DOMException):
+    code = WRONG_DOCUMENT_ERR
+
+class InvalidCharacterErr(DOMException):
+    code = INVALID_CHARACTER_ERR
+
+class NoDataAllowedErr(DOMException):
+    code = NO_DATA_ALLOWED_ERR
+
+class NoModificationAllowedErr(DOMException):
+    code = NO_MODIFICATION_ALLOWED_ERR
+
+class NotFoundErr(DOMException):
+    code = NOT_FOUND_ERR
+
+class NotSupportedErr(DOMException):
+    code = NOT_SUPPORTED_ERR
+
+class InuseAttributeErr(DOMException):
+    code = INUSE_ATTRIBUTE_ERR
+
+class InvalidStateErr(DOMException):
+    code = INVALID_STATE_ERR
+
+class SyntaxErr(DOMException):
+    code = SYNTAX_ERR
+
+class InvalidModificationErr(DOMException):
+    code = INVALID_MODIFICATION_ERR
+
+class NamespaceErr(DOMException):
+    code = NAMESPACE_ERR
+
+class InvalidAccessErr(DOMException):
+    code = INVALID_ACCESS_ERR
+
+class ValidationErr(DOMException):
+    code = VALIDATION_ERR
+
+class UserDataHandler:
+    """Class giving the operation constants for UserDataHandler.handle()."""
+
+    # Based on DOM Level 3 (WD 9 April 2002)
+
+    NODE_CLONED   = 1
+    NODE_IMPORTED = 2
+    NODE_DELETED  = 3
+    NODE_RENAMED  = 4
+
+XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace"
+XMLNS_NAMESPACE = "http://www.w3.org/2000/xmlns/"
+XHTML_NAMESPACE = "http://www.w3.org/1999/xhtml"
+EMPTY_NAMESPACE = None
+EMPTY_PREFIX = None
+
+import xml.dom.domreg as domreg
+
+getDOMImplementation      = domreg.getDOMImplementation
+registerDOMImplementation = domreg.registerDOMImplementation
+
diff --git a/modules/language/python/module/xml/dom/NodeFilter.py b/modules/language/python/module/xml/dom/NodeFilter.py
new file mode 100644
index 0000000..9662d86
--- /dev/null
+++ b/modules/language/python/module/xml/dom/NodeFilter.py
@@ -0,0 +1,29 @@
+module(xml,dom,NodeFilter)
+
+# This is the Python mapping for interface NodeFilter from
+# DOM2-Traversal-Range. It contains only constants.
+
+class NodeFilter:
+    """
+    This is the DOM2 NodeFilter interface. It contains only constants.
+    """
+    FILTER_ACCEPT = 1
+    FILTER_REJECT = 2
+    FILTER_SKIP   = 3
+
+    SHOW_ALL                    = 0xFFFFFFFF
+    SHOW_ELEMENT                = 0x00000001
+    SHOW_ATTRIBUTE              = 0x00000002
+    SHOW_TEXT                   = 0x00000004
+    SHOW_CDATA_SECTION          = 0x00000008
+    SHOW_ENTITY_REFERENCE       = 0x00000010
+    SHOW_ENTITY                 = 0x00000020
+    SHOW_PROCESSING_INSTRUCTION = 0x00000040
+    SHOW_COMMENT                = 0x00000080
+    SHOW_DOCUMENT               = 0x00000100
+    SHOW_DOCUMENT_TYPE          = 0x00000200
+    SHOW_DOCUMENT_FRAGMENT      = 0x00000400
+    SHOW_NOTATION               = 0x00000800
+
+    def acceptNode(self, node):
+        raise NotImplementedError
diff --git a/modules/language/python/module/xml/dom/__init__.py b/modules/language/python/module/xml/dom/__init__.py
new file mode 100644
index 0000000..97cf9a6
--- /dev/null
+++ b/modules/language/python/module/xml/dom/__init__.py
@@ -0,0 +1,140 @@
+"""W3C Document Object Model implementation for Python.
+
+The Python mapping of the Document Object Model is documented in the
+Python Library Reference in the section on the xml.dom package.
+
+This package contains the following modules:
+
+minidom -- A simple implementation of the Level 1 DOM with namespace
+           support added (based on the Level 2 specification) and other
+           minor Level 2 functionality.
+
+pulldom -- DOM builder supporting on-demand tree-building for selected
+           subtrees of the document.
+
+"""
+
+
+class Node:
+    """Class giving the NodeType constants."""
+    __slots__ = ()
+
+    # DOM implementations may use this as a base class for their own
+    # Node implementations.  If they don't, the constants defined here
+    # should still be used as the canonical definitions as they match
+    # the values given in the W3C recommendation.  Client code can
+    # safely refer to these values in all tests of Node.nodeType
+    # values.
+
+    ELEMENT_NODE                = 1
+    ATTRIBUTE_NODE              = 2
+    TEXT_NODE                   = 3
+    CDATA_SECTION_NODE          = 4
+    ENTITY_REFERENCE_NODE       = 5
+    ENTITY_NODE                 = 6
+    PROCESSING_INSTRUCTION_NODE = 7
+    COMMENT_NODE                = 8
+    DOCUMENT_NODE               = 9
+    DOCUMENT_TYPE_NODE          = 10
+    DOCUMENT_FRAGMENT_NODE      = 11
+    NOTATION_NODE               = 12
+
+
+#ExceptionCode
+INDEX_SIZE_ERR                 = 1
+DOMSTRING_SIZE_ERR             = 2
+HIERARCHY_REQUEST_ERR          = 3
+WRONG_DOCUMENT_ERR             = 4
+INVALID_CHARACTER_ERR          = 5
+NO_DATA_ALLOWED_ERR            = 6
+NO_MODIFICATION_ALLOWED_ERR    = 7
+NOT_FOUND_ERR                  = 8
+NOT_SUPPORTED_ERR              = 9
+INUSE_ATTRIBUTE_ERR            = 10
+INVALID_STATE_ERR              = 11
+SYNTAX_ERR                     = 12
+INVALID_MODIFICATION_ERR       = 13
+NAMESPACE_ERR                  = 14
+INVALID_ACCESS_ERR             = 15
+VALIDATION_ERR                 = 16
+
+
+class DOMException(Exception):
+    """Abstract base class for DOM exceptions.
+    Exceptions with specific codes are specializations of this class."""
+
+    def __init__(self, *args, **kw):
+        if self.__class__ is DOMException:
+            raise RuntimeError(
+                "DOMException should not be instantiated directly")
+        Exception.__init__(self, *args, **kw)
+
+    def _get_code(self):
+        return self.code
+
+
+class IndexSizeErr(DOMException):
+    code = INDEX_SIZE_ERR
+
+class DomstringSizeErr(DOMException):
+    code = DOMSTRING_SIZE_ERR
+
+class HierarchyRequestErr(DOMException):
+    code = HIERARCHY_REQUEST_ERR
+
+class WrongDocumentErr(DOMException):
+    code = WRONG_DOCUMENT_ERR
+
+class InvalidCharacterErr(DOMException):
+    code = INVALID_CHARACTER_ERR
+
+class NoDataAllowedErr(DOMException):
+    code = NO_DATA_ALLOWED_ERR
+
+class NoModificationAllowedErr(DOMException):
+    code = NO_MODIFICATION_ALLOWED_ERR
+
+class NotFoundErr(DOMException):
+    code = NOT_FOUND_ERR
+
+class NotSupportedErr(DOMException):
+    code = NOT_SUPPORTED_ERR
+
+class InuseAttributeErr(DOMException):
+    code = INUSE_ATTRIBUTE_ERR
+
+class InvalidStateErr(DOMException):
+    code = INVALID_STATE_ERR
+
+class SyntaxErr(DOMException):
+    code = SYNTAX_ERR
+
+class InvalidModificationErr(DOMException):
+    code = INVALID_MODIFICATION_ERR
+
+class NamespaceErr(DOMException):
+    code = NAMESPACE_ERR
+
+class InvalidAccessErr(DOMException):
+    code = INVALID_ACCESS_ERR
+
+class ValidationErr(DOMException):
+    code = VALIDATION_ERR
+
+class UserDataHandler:
+    """Class giving the operation constants for UserDataHandler.handle()."""
+
+    # Based on DOM Level 3 (WD 9 April 2002)
+
+    NODE_CLONED   = 1
+    NODE_IMPORTED = 2
+    NODE_DELETED  = 3
+    NODE_RENAMED  = 4
+
+XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace"
+XMLNS_NAMESPACE = "http://www.w3.org/2000/xmlns/"
+XHTML_NAMESPACE = "http://www.w3.org/1999/xhtml"
+EMPTY_NAMESPACE = None
+EMPTY_PREFIX = None
+
+from .domreg import getDOMImplementation, registerDOMImplementation
diff --git a/modules/language/python/module/xml/dom/domreg.py b/modules/language/python/module/xml/dom/domreg.py
new file mode 100644
index 0000000..7e7b8ba
--- /dev/null
+++ b/modules/language/python/module/xml/dom/domreg.py
@@ -0,0 +1,101 @@
+module(xml,dom,domreg)
+
+__all__= ['getDOMImplementation','registerDOMImplementation']
+
+"""Registration facilities for DOM. This module should not be used
+directly. Instead, the functions getDOMImplementation and
+registerDOMImplementation should be imported from xml.dom."""
+
+# This is a list of well-known implementations.  Well-known names
+# should be published by posting to xml-sig@python.org, and are
+# subsequently recorded in this file.
+
+well_known_implementations = {
+    'minidom':'xml.dom.minidom',
+    '4DOM': 'xml.dom.DOMImplementation',
+    }
+
+# DOM implementations not officially registered should register
+# themselves with their
+
+registered = {}
+
+def registerDOMImplementation(name, factory):
+    """registerDOMImplementation(name, factory)
+
+    Register the factory function with the name. The factory function
+    should return an object which implements the DOMImplementation
+    interface. The factory function can either return the same object,
+    or a new one (e.g. if that implementation supports some
+    customization)."""
+
+    registered[name] = factory
+
+def _good_enough(dom, features):
+    "_good_enough(dom, features) -> Return 1 if the dom offers the features"
+    for f,v in features:
+        if not dom.hasFeature(f,v):
+            return 0
+    return 1
+
+def getDOMImplementation(name=None, features=()):
+    """getDOMImplementation(name = None, features = ()) -> DOM implementation.
+
+    Return a suitable DOM implementation. The name is either
+    well-known, the module name of a DOM implementation, or None. If
+    it is not None, imports the corresponding module and returns
+    DOMImplementation object if the import succeeds.
+
+    If name is not given, consider the available implementations to
+    find one with the required feature set. If no implementation can
+    be found, raise an ImportError. The features list must be a sequence
+    of (feature, version) pairs which are passed to hasFeature."""
+
+    import os
+    creator = None
+    mod = well_known_implementations.get(name)
+    if mod:
+        mod = __import__(mod, {}, {}, ['getDOMImplementation'])
+        return mod.getDOMImplementation()
+    elif name:
+        return registered[name]()
+    elif "PYTHON_DOM" in os.environ:
+        return getDOMImplementation(name = os.environ["PYTHON_DOM"])
+
+    # User did not specify a name, try implementations in arbitrary
+    # order, returning the one that has the required features
+    if isinstance(features, str):
+        features = _parse_feature_string(features)
+    for creator in registered.values():
+        dom = creator()
+        if _good_enough(dom, features):
+            return dom
+
+    for creator in well_known_implementations.keys():
+        try:
+            dom = getDOMImplementation(name = creator)
+        except Exception: # typically ImportError, or AttributeError
+            continue
+        if _good_enough(dom, features):
+            return dom
+
+    raise ImportError("no suitable DOM implementation found")
+
+def _parse_feature_string(s):
+    features = []
+    parts = s.split()
+    i = 0
+    length = len(parts)
+    while i < length:
+        feature = parts[i]
+        if feature[0] in "0123456789":
+            raise ValueError("bad feature name: %r" % (feature,))
+        i = i + 1
+        version = None
+        if i < length:
+            v = parts[i]
+            if v[0] in "0123456789":
+                i = i + 1
+                version = v
+        features.append((feature, version))
+    return tuple(features)
diff --git a/modules/language/python/module/xml/dom/expatbuilder.py b/modules/language/python/module/xml/dom/expatbuilder.py
new file mode 100644
index 0000000..8e975cd
--- /dev/null
+++ b/modules/language/python/module/xml/dom/expatbuilder.py
@@ -0,0 +1,967 @@
+module(xml,dom,expatbuilder)
+
+"""Facility to use the Expat parser to load a minidom instance
+from a string or file.
+
+This avoids all the overhead of SAX and pulldom to gain performance.
+"""
+
+# Warning!
+#
+# This module is tightly bound to the implementation details of the
+# minidom DOM and can't be used with other DOM implementations.  This
+# is due, in part, to a lack of appropriate methods in the DOM (there is
+# no way to create Entity and Notation nodes via the DOM Level 2
+# interface), and for performance.  The latter is the cause of some fairly
+# cryptic code.
+#
+# Performance hacks:
+#
+#   -  .character_data_handler() has an extra case in which continuing
+#      data is appended to an existing Text node; this can be a
+#      speedup since pyexpat can break up character data into multiple
+#      callbacks even though we set the buffer_text attribute on the
+#      parser.  This also gives us the advantage that we don't need a
+#      separate normalization pass.
+#
+#   -  Determining that a node exists is done using an identity comparison
+#      with None rather than a truth test; this avoids searching for and
+#      calling any methods on the node object if it exists.  (A rather
+#      nice speedup is achieved this way as well!)
+
+from xml.dom import xmlbuilder, minidom, Node
+from xml.dom import EMPTY_NAMESPACE, EMPTY_PREFIX, XMLNS_NAMESPACE
+from xml.parsers import expat
+from xml.dom.minidom import _append_child, _set_attribute_node
+from xml.dom.NodeFilter import NodeFilter
+
+TEXT_NODE = Node.TEXT_NODE
+CDATA_SECTION_NODE = Node.CDATA_SECTION_NODE
+DOCUMENT_NODE = Node.DOCUMENT_NODE
+
+FILTER_ACCEPT = xmlbuilder.DOMBuilderFilter.FILTER_ACCEPT
+FILTER_REJECT = xmlbuilder.DOMBuilderFilter.FILTER_REJECT
+FILTER_SKIP = xmlbuilder.DOMBuilderFilter.FILTER_SKIP
+FILTER_INTERRUPT = xmlbuilder.DOMBuilderFilter.FILTER_INTERRUPT
+
+theDOMImplementation = minidom.getDOMImplementation()
+
+# Expat typename -> TypeInfo
+_typeinfo_map = {
+    "CDATA":    minidom.TypeInfo(None, "cdata"),
+    "ENUM":     minidom.TypeInfo(None, "enumeration"),
+    "ENTITY":   minidom.TypeInfo(None, "entity"),
+    "ENTITIES": minidom.TypeInfo(None, "entities"),
+    "ID":       minidom.TypeInfo(None, "id"),
+    "IDREF":    minidom.TypeInfo(None, "idref"),
+    "IDREFS":   minidom.TypeInfo(None, "idrefs"),
+    "NMTOKEN":  minidom.TypeInfo(None, "nmtoken"),
+    "NMTOKENS": minidom.TypeInfo(None, "nmtokens"),
+    }
+
+class ElementInfo(object):
+    __slots__ = '_attr_info', '_model', 'tagName'
+
+    def __init__(self, tagName, model=None):
+        self.tagName = tagName
+        self._attr_info = []
+        self._model = model
+
+    def __getstate__(self):
+        return self._attr_info, self._model, self.tagName
+
+    def __setstate__(self, state):
+        self._attr_info, self._model, self.tagName = state
+
+    def getAttributeType(self, aname):
+        for info in self._attr_info:
+            if info[1] == aname:
+                t = info[-2]
+                if t[0] == "(":
+                    return _typeinfo_map["ENUM"]
+                else:
+                    return _typeinfo_map[info[-2]]
+        return minidom._no_type
+
+    def getAttributeTypeNS(self, namespaceURI, localName):
+        return minidom._no_type
+
+    def isElementContent(self):
+        if self._model:
+            type = self._model[0]
+            return type not in (expat.model.XML_CTYPE_ANY,
+                                expat.model.XML_CTYPE_MIXED)
+        else:
+            return False
+
+    def isEmpty(self):
+        if self._model:
+            return self._model[0] == expat.model.XML_CTYPE_EMPTY
+        else:
+            return False
+
+    def isId(self, aname):
+        for info in self._attr_info:
+            if info[1] == aname:
+                return info[-2] == "ID"
+        return False
+
+    def isIdNS(self, euri, ename, auri, aname):
+        # not sure this is meaningful
+        return self.isId((auri, aname))
+
+def _intern(builder, s):
+    return builder._intern_setdefault(s, s)
+
+def _parse_ns_name(builder, name):
+    assert ' ' in name
+    parts = name.split(' ')
+    intern = builder._intern_setdefault
+    if len(parts) == 3:
+        uri, localname, prefix = parts
+        prefix = intern(prefix, prefix)
+        qname = "%s:%s" % (prefix, localname)
+        qname = intern(qname, qname)
+        localname = intern(localname, localname)
+    elif len(parts) == 2:
+        uri, localname = parts
+        prefix = EMPTY_PREFIX
+        qname = localname = intern(localname, localname)
+    else:
+        raise ValueError("Unsupported syntax: spaces in URIs not supported: %r" % name)
+    return intern(uri, uri), localname, prefix, qname
+
+
+class ExpatBuilder:
+    """Document builder that uses Expat to build a ParsedXML.DOM document
+    instance."""
+
+    def __init__(self, options=None):
+        if options is None:
+            options = xmlbuilder.Options()
+        self._options = options
+        if self._options.filter is not None:
+            self._filter = FilterVisibilityController(self._options.filter)
+        else:
+            self._filter = None
+            # This *really* doesn't do anything in this case, so
+            # override it with something fast & minimal.
+            self._finish_start_element = id
+        self._parser = None
+        self.reset()
+
+    def createParser(self):
+        """Create a new parser object."""
+        return expat.ParserCreate()
+
+    def getParser(self):
+        """Return the parser object, creating a new one if needed."""
+        if not self._parser:
+            self._parser = self.createParser()
+            self._intern_setdefault = self._parser.intern.setdefault
+            self._parser.buffer_text = True
+            self._parser.ordered_attributes = True
+            self._parser.specified_attributes = True
+            self.install(self._parser)
+        return self._parser
+
+    def reset(self):
+        """Free all data structures used during DOM construction."""
+        self.document = theDOMImplementation.createDocument(
+            EMPTY_NAMESPACE, None, None)
+        self.curNode = self.document
+        self._elem_info = self.document._elem_info
+        self._cdata = False
+
+    def install(self, parser):
+        """Install the callbacks needed to build the DOM into the parser."""
+        # This creates circular references!
+        parser.StartDoctypeDeclHandler = self.start_doctype_decl_handler
+        parser.StartElementHandler = self.first_element_handler
+        parser.EndElementHandler = self.end_element_handler
+        parser.ProcessingInstructionHandler = self.pi_handler
+        if self._options.entities:
+            parser.EntityDeclHandler = self.entity_decl_handler
+        parser.NotationDeclHandler = self.notation_decl_handler
+        if self._options.comments:
+            parser.CommentHandler = self.comment_handler
+        if self._options.cdata_sections:
+            parser.StartCdataSectionHandler = self.start_cdata_section_handler
+            parser.EndCdataSectionHandler = self.end_cdata_section_handler
+            parser.CharacterDataHandler = self.character_data_handler_cdata
+        else:
+            parser.CharacterDataHandler = self.character_data_handler
+        parser.ExternalEntityRefHandler = self.external_entity_ref_handler
+        parser.XmlDeclHandler = self.xml_decl_handler
+        parser.ElementDeclHandler = self.element_decl_handler
+        parser.AttlistDeclHandler = self.attlist_decl_handler
+
+    def parseFile(self, file):
+        """Parse a document from a file object, returning the document
+        node."""
+        parser = self.getParser()
+        first_buffer = True
+        try:
+            while 1:
+                buffer = file.read(16*1024)
+                if not buffer:
+                    break
+                parser.Parse(buffer, 0)
+                if first_buffer and self.document.documentElement:
+                    self._setup_subset(buffer)
+                first_buffer = False
+            parser.Parse("", True)
+        except ParseEscape:
+            pass
+        doc = self.document
+        self.reset()
+        self._parser = None
+        return doc
+
+    def parseString(self, string):
+        """Parse a document from a string, returning the document node."""
+        parser = self.getParser()
+        try:
+            parser.Parse(string, True)
+            self._setup_subset(string)
+        except ParseEscape:
+            pass
+        doc = self.document
+        self.reset()
+        self._parser = None
+        return doc
+
+    def _setup_subset(self, buffer):
+        """Load the internal subset if there might be one."""
+        if self.document.doctype:
+            extractor = InternalSubsetExtractor()
+            extractor.parseString(buffer)
+            subset = extractor.getSubset()
+            self.document.doctype.internalSubset = subset
+
+    def start_doctype_decl_handler(self, doctypeName, systemId, publicId,
+                                   has_internal_subset):
+        doctype = self.document.implementation.createDocumentType(
+            doctypeName, publicId, systemId)
+        doctype.ownerDocument = self.document
+        _append_child(self.document, doctype)
+        self.document.doctype = doctype
+        if self._filter and self._filter.acceptNode(doctype) == FILTER_REJECT:
+            self.document.doctype = None
+            del self.document.childNodes[-1]
+            doctype = None
+            self._parser.EntityDeclHandler = None
+            self._parser.NotationDeclHandler = None
+        if has_internal_subset:
+            if doctype is not None:
+                doctype.entities._seq = []
+                doctype.notations._seq = []
+            self._parser.CommentHandler = None
+            self._parser.ProcessingInstructionHandler = None
+            self._parser.EndDoctypeDeclHandler = self.end_doctype_decl_handler
+
+    def end_doctype_decl_handler(self):
+        if self._options.comments:
+            self._parser.CommentHandler = self.comment_handler
+        self._parser.ProcessingInstructionHandler = self.pi_handler
+        if not (self._elem_info or self._filter):
+            self._finish_end_element = id
+
+    def pi_handler(self, target, data):
+        node = self.document.createProcessingInstruction(target, data)
+        _append_child(self.curNode, node)
+        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
+            self.curNode.removeChild(node)
+
+    def character_data_handler_cdata(self, data):
+        childNodes = self.curNode.childNodes
+        if self._cdata:
+            if (  self._cdata_continue
+                  and childNodes[-1].nodeType == CDATA_SECTION_NODE):
+                childNodes[-1].appendData(data)
+                return
+            node = self.document.createCDATASection(data)
+            self._cdata_continue = True
+        elif childNodes and childNodes[-1].nodeType == TEXT_NODE:
+            node = childNodes[-1]
+            value = node.data + data
+            node.data = value
+            return
+        else:
+            node = minidom.Text()
+            node.data = data
+            node.ownerDocument = self.document
+        _append_child(self.curNode, node)
+
+    def character_data_handler(self, data):
+        childNodes = self.curNode.childNodes
+        if childNodes and childNodes[-1].nodeType == TEXT_NODE:
+            node = childNodes[-1]
+            node.data = node.data + data
+            return
+        node = minidom.Text()
+        node.data = node.data + data
+        node.ownerDocument = self.document
+        _append_child(self.curNode, node)
+
+    def entity_decl_handler(self, entityName, is_parameter_entity, value,
+                            base, systemId, publicId, notationName):
+        if is_parameter_entity:
+            # we don't care about parameter entities for the DOM
+            return
+        if not self._options.entities:
+            return
+        node = self.document._create_entity(entityName, publicId,
+                                            systemId, notationName)
+        if value is not None:
+            # internal entity
+            # node *should* be readonly, but we'll cheat
+            child = self.document.createTextNode(value)
+            node.childNodes.append(child)
+        self.document.doctype.entities._seq.append(node)
+        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
+            del self.document.doctype.entities._seq[-1]
+
+    def notation_decl_handler(self, notationName, base, systemId, publicId):
+        node = self.document._create_notation(notationName, publicId, systemId)
+        self.document.doctype.notations._seq.append(node)
+        if self._filter and self._filter.acceptNode(node) == FILTER_ACCEPT:
+            del self.document.doctype.notations._seq[-1]
+
+    def comment_handler(self, data):
+        node = self.document.createComment(data)
+        _append_child(self.curNode, node)
+        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
+            self.curNode.removeChild(node)
+
+    def start_cdata_section_handler(self):
+        self._cdata = True
+        self._cdata_continue = False
+
+    def end_cdata_section_handler(self):
+        self._cdata = False
+        self._cdata_continue = False
+
+    def external_entity_ref_handler(self, context, base, systemId, publicId):
+        return 1
+
+    def first_element_handler(self, name, attributes):
+        if self._filter is None and not self._elem_info:
+            self._finish_end_element = id
+        self.getParser().StartElementHandler = self.start_element_handler
+        self.start_element_handler(name, attributes)
+
+    def start_element_handler(self, name, attributes):
+        node = self.document.createElement(name)
+        _append_child(self.curNode, node)
+        self.curNode = node
+
+        if attributes:
+            for i in range(0, len(attributes), 2):
+                a = minidom.Attr(attributes[i], EMPTY_NAMESPACE,
+                                 None, EMPTY_PREFIX)
+                value = attributes[i+1]
+                a.value = value
+                a.ownerDocument = self.document
+                _set_attribute_node(node, a)
+
+        if node is not self.document.documentElement:
+            self._finish_start_element(node)
+
+    def _finish_start_element(self, node):
+        if self._filter:
+            # To be general, we'd have to call isSameNode(), but this
+            # is sufficient for minidom:
+            if node is self.document.documentElement:
+                return
+            filt = self._filter.startContainer(node)
+            if filt == FILTER_REJECT:
+                # ignore this node & all descendents
+                Rejecter(self)
+            elif filt == FILTER_SKIP:
+                # ignore this node, but make it's children become
+                # children of the parent node
+                Skipper(self)
+            else:
+                return
+            self.curNode = node.parentNode
+            node.parentNode.removeChild(node)
+            node.unlink()
+
+    # If this ever changes, Namespaces.end_element_handler() needs to
+    # be changed to match.
+    #
+    def end_element_handler(self, name):
+        curNode = self.curNode
+        self.curNode = curNode.parentNode
+        self._finish_end_element(curNode)
+
+    def _finish_end_element(self, curNode):
+        info = self._elem_info.get(curNode.tagName)
+        if info:
+            self._handle_white_text_nodes(curNode, info)
+        if self._filter:
+            if curNode is self.document.documentElement:
+                return
+            if self._filter.acceptNode(curNode) == FILTER_REJECT:
+                self.curNode.removeChild(curNode)
+                curNode.unlink()
+
+    def _handle_white_text_nodes(self, node, info):
+        if (self._options.whitespace_in_element_content
+            or not info.isElementContent()):
+            return
+
+        # We have element type information and should remove ignorable
+        # whitespace; identify for text nodes which contain only
+        # whitespace.
+        L = []
+        for child in node.childNodes:
+            if child.nodeType == TEXT_NODE and not child.data.strip():
+                L.append(child)
+
+        # Remove ignorable whitespace from the tree.
+        for child in L:
+            node.removeChild(child)
+
+    def element_decl_handler(self, name, model):
+        info = self._elem_info.get(name)
+        if info is None:
+            self._elem_info[name] = ElementInfo(name, model)
+        else:
+            assert info._model is None
+            info._model = model
+
+    def attlist_decl_handler(self, elem, name, type, default, required):
+        info = self._elem_info.get(elem)
+        if info is None:
+            info = ElementInfo(elem)
+            self._elem_info[elem] = info
+        info._attr_info.append(
+            [None, name, None, None, default, 0, type, required])
+
+    def xml_decl_handler(self, version, encoding, standalone):
+        self.document.version = version
+        self.document.encoding = encoding
+        # This is still a little ugly, thanks to the pyexpat API. ;-(
+        if standalone >= 0:
+            if standalone:
+                self.document.standalone = True
+            else:
+                self.document.standalone = False
+
+
+# Don't include FILTER_INTERRUPT, since that's checked separately
+# where allowed.
+_ALLOWED_FILTER_RETURNS = (FILTER_ACCEPT, FILTER_REJECT, FILTER_SKIP)
+
+class FilterVisibilityController(object):
+    """Wrapper around a DOMBuilderFilter which implements the checks
+    to make the whatToShow filter attribute work."""
+
+    __slots__ = 'filter',
+
+    def __init__(self, filter):
+        self.filter = filter
+
+    def startContainer(self, node):
+        mask = self._nodetype_mask[node.nodeType]
+        if self.filter.whatToShow & mask:
+            val = self.filter.startContainer(node)
+            if val == FILTER_INTERRUPT:
+                raise ParseEscape
+            if val not in _ALLOWED_FILTER_RETURNS:
+                raise ValueError(
+                      "startContainer() returned illegal value: " + repr(val))
+            return val
+        else:
+            return FILTER_ACCEPT
+
+    def acceptNode(self, node):
+        mask = self._nodetype_mask[node.nodeType]
+        if self.filter.whatToShow & mask:
+            val = self.filter.acceptNode(node)
+            if val == FILTER_INTERRUPT:
+                raise ParseEscape
+            if val == FILTER_SKIP:
+                # move all child nodes to the parent, and remove this node
+                parent = node.parentNode
+                for child in node.childNodes[:]:
+                    parent.appendChild(child)
+                # node is handled by the caller
+                return FILTER_REJECT
+            if val not in _ALLOWED_FILTER_RETURNS:
+                raise ValueError(
+                      "acceptNode() returned illegal value: " + repr(val))
+            return val
+        else:
+            return FILTER_ACCEPT
+
+    _nodetype_mask = {
+        Node.ELEMENT_NODE:                NodeFilter.SHOW_ELEMENT,
+        Node.ATTRIBUTE_NODE:              NodeFilter.SHOW_ATTRIBUTE,
+        Node.TEXT_NODE:                   NodeFilter.SHOW_TEXT,
+        Node.CDATA_SECTION_NODE:          NodeFilter.SHOW_CDATA_SECTION,
+        Node.ENTITY_REFERENCE_NODE:       NodeFilter.SHOW_ENTITY_REFERENCE,
+        Node.ENTITY_NODE:                 NodeFilter.SHOW_ENTITY,
+        Node.PROCESSING_INSTRUCTION_NODE: NodeFilter.SHOW_PROCESSING_INSTRUCTION,
+        Node.COMMENT_NODE:                NodeFilter.SHOW_COMMENT,
+        Node.DOCUMENT_NODE:               NodeFilter.SHOW_DOCUMENT,
+        Node.DOCUMENT_TYPE_NODE:          NodeFilter.SHOW_DOCUMENT_TYPE,
+        Node.DOCUMENT_FRAGMENT_NODE:      NodeFilter.SHOW_DOCUMENT_FRAGMENT,
+        Node.NOTATION_NODE:               NodeFilter.SHOW_NOTATION,
+        }
+
+
+class FilterCrutch(object):
+    __slots__ = '_builder', '_level', '_old_start', '_old_end'
+
+    def __init__(self, builder):
+        self._level = 0
+        self._builder = builder
+        parser = builder._parser
+        self._old_start = parser.StartElementHandler
+        self._old_end = parser.EndElementHandler
+        parser.StartElementHandler = self.start_element_handler
+        parser.EndElementHandler = self.end_element_handler
+
+class Rejecter(FilterCrutch):
+    __slots__ = ()
+
+    def __init__(self, builder):
+        FilterCrutch.__init__(self, builder)
+        parser = builder._parser
+        for name in ("ProcessingInstructionHandler",
+                     "CommentHandler",
+                     "CharacterDataHandler",
+                     "StartCdataSectionHandler",
+                     "EndCdataSectionHandler",
+                     "ExternalEntityRefHandler",
+                     ):
+            setattr(parser, name, None)
+
+    def start_element_handler(self, *args):
+        self._level = self._level + 1
+
+    def end_element_handler(self, *args):
+        if self._level == 0:
+            # restore the old handlers
+            parser = self._builder._parser
+            self._builder.install(parser)
+            parser.StartElementHandler = self._old_start
+            parser.EndElementHandler = self._old_end
+        else:
+            self._level = self._level - 1
+
+class Skipper(FilterCrutch):
+    __slots__ = ()
+
+    def start_element_handler(self, *args):
+        node = self._builder.curNode
+        self._old_start(*args)
+        if self._builder.curNode is not node:
+            self._level = self._level + 1
+
+    def end_element_handler(self, *args):
+        if self._level == 0:
+            # We're popping back out of the node we're skipping, so we
+            # shouldn't need to do anything but reset the handlers.
+            self._builder._parser.StartElementHandler = self._old_start
+            self._builder._parser.EndElementHandler = self._old_end
+            self._builder = None
+        else:
+            self._level = self._level - 1
+            self._old_end(*args)
+
+
+# framework document used by the fragment builder.
+# Takes a string for the doctype, subset string, and namespace attrs string.
+
+_FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID = \
+    "http://xml.python.org/entities/fragment-builder/internal"
+
+_FRAGMENT_BUILDER_TEMPLATE = (
+    '''\
+<!DOCTYPE wrapper
+  %%s [
+  <!ENTITY fragment-builder-internal
+    SYSTEM "%s">
+%%s
+]>
+<wrapper %%s
+>&fragment-builder-internal;</wrapper>'''
+    % _FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID)
+
+
+class FragmentBuilder(ExpatBuilder):
+    """Builder which constructs document fragments given XML source
+    text and a context node.
+
+    The context node is expected to provide information about the
+    namespace declarations which are in scope at the start of the
+    fragment.
+    """
+
+    def __init__(self, context, options=None):
+        if context.nodeType == DOCUMENT_NODE:
+            self.originalDocument = context
+            self.context = context
+        else:
+            self.originalDocument = context.ownerDocument
+            self.context = context
+        ExpatBuilder.__init__(self, options)
+
+    def reset(self):
+        ExpatBuilder.reset(self)
+        self.fragment = None
+
+    def parseFile(self, file):
+        """Parse a document fragment from a file object, returning the
+        fragment node."""
+        return self.parseString(file.read())
+
+    def parseString(self, string):
+        """Parse a document fragment from a string, returning the
+        fragment node."""
+        self._source = string
+        parser = self.getParser()
+        doctype = self.originalDocument.doctype
+        ident = ""
+        if doctype:
+            subset = doctype.internalSubset or self._getDeclarations()
+            if doctype.publicId:
+                ident = ('PUBLIC "%s" "%s"'
+                         % (doctype.publicId, doctype.systemId))
+            elif doctype.systemId:
+                ident = 'SYSTEM "%s"' % doctype.systemId
+        else:
+            subset = ""
+        nsattrs = self._getNSattrs() # get ns decls from node's ancestors
+        document = _FRAGMENT_BUILDER_TEMPLATE % (ident, subset, nsattrs)
+        try:
+            parser.Parse(document, 1)
+        except:
+            self.reset()
+            raise
+        fragment = self.fragment
+        self.reset()
+##         self._parser = None
+        return fragment
+
+    def _getDeclarations(self):
+        """Re-create the internal subset from the DocumentType node.
+
+        This is only needed if we don't already have the
+        internalSubset as a string.
+        """
+        doctype = self.context.ownerDocument.doctype
+        s = ""
+        if doctype:
+            for i in range(doctype.notations.length):
+                notation = doctype.notations.item(i)
+                if s:
+                    s = s + "\n  "
+                s = "%s<!NOTATION %s" % (s, notation.nodeName)
+                if notation.publicId:
+                    s = '%s PUBLIC "%s"\n             "%s">' \
+                        % (s, notation.publicId, notation.systemId)
+                else:
+                    s = '%s SYSTEM "%s">' % (s, notation.systemId)
+            for i in range(doctype.entities.length):
+                entity = doctype.entities.item(i)
+                if s:
+                    s = s + "\n  "
+                s = "%s<!ENTITY %s" % (s, entity.nodeName)
+                if entity.publicId:
+                    s = '%s PUBLIC "%s"\n             "%s"' \
+                        % (s, entity.publicId, entity.systemId)
+                elif entity.systemId:
+                    s = '%s SYSTEM "%s"' % (s, entity.systemId)
+                else:
+                    s = '%s "%s"' % (s, entity.firstChild.data)
+                if entity.notationName:
+                    s = "%s NOTATION %s" % (s, entity.notationName)
+                s = s + ">"
+        return s
+
+    def _getNSattrs(self):
+        return ""
+
+    def external_entity_ref_handler(self, context, base, systemId, publicId):
+        if systemId == _FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID:
+            # this entref is the one that we made to put the subtree
+            # in; all of our given input is parsed in here.
+            old_document = self.document
+            old_cur_node = self.curNode
+            parser = self._parser.ExternalEntityParserCreate(context)
+            # put the real document back, parse into the fragment to return
+            self.document = self.originalDocument
+            self.fragment = self.document.createDocumentFragment()
+            self.curNode = self.fragment
+            try:
+                parser.Parse(self._source, 1)
+            finally:
+                self.curNode = old_cur_node
+                self.document = old_document
+                self._source = None
+            return -1
+        else:
+            return ExpatBuilder.external_entity_ref_handler(
+                self, context, base, systemId, publicId)
+
+
+class Namespaces:
+    """Mix-in class for builders; adds support for namespaces."""
+
+    def _initNamespaces(self):
+        # list of (prefix, uri) ns declarations.  Namespace attrs are
+        # constructed from this and added to the element's attrs.
+        self._ns_ordered_prefixes = []
+
+    def createParser(self):
+        """Create a new namespace-handling parser."""
+        parser = expat.ParserCreate(namespace_separator=" ")
+        parser.namespace_prefixes = True
+        return parser
+
+    def install(self, parser):
+        """Insert the namespace-handlers onto the parser."""
+        ExpatBuilder.install(self, parser)
+        if self._options.namespace_declarations:
+            parser.StartNamespaceDeclHandler = (
+                self.start_namespace_decl_handler)
+
+    def start_namespace_decl_handler(self, prefix, uri):
+        """Push this namespace declaration on our storage."""
+        self._ns_ordered_prefixes.append((prefix, uri))
+
+    def start_element_handler(self, name, attributes):
+        if ' ' in name:
+            uri, localname, prefix, qname = _parse_ns_name(self, name)
+        else:
+            uri = EMPTY_NAMESPACE
+            qname = name
+            localname = None
+            prefix = EMPTY_PREFIX
+        node = minidom.Element(qname, uri, prefix, localname)
+        node.ownerDocument = self.document
+        _append_child(self.curNode, node)
+        self.curNode = node
+
+        if self._ns_ordered_prefixes:
+            for prefix, uri in self._ns_ordered_prefixes:
+                if prefix:
+                    a = minidom.Attr(_intern(self, 'xmlns:' + prefix),
+                                     XMLNS_NAMESPACE, prefix, "xmlns")
+                else:
+                    a = minidom.Attr("xmlns", XMLNS_NAMESPACE,
+                                     "xmlns", EMPTY_PREFIX)
+                a.value = uri
+                a.ownerDocument = self.document
+                _set_attribute_node(node, a)
+            del self._ns_ordered_prefixes[:]
+
+        if attributes:
+            node._ensure_attributes()
+            _attrs = node._attrs
+            _attrsNS = node._attrsNS
+            for i in range(0, len(attributes), 2):
+                aname = attributes[i]
+                value = attributes[i+1]
+                if ' ' in aname:
+                    uri, localname, prefix, qname = _parse_ns_name(self, aname)
+                    a = minidom.Attr(qname, uri, localname, prefix)
+                    _attrs[qname] = a
+                    _attrsNS[(uri, localname)] = a
+                else:
+                    a = minidom.Attr(aname, EMPTY_NAMESPACE,
+                                     aname, EMPTY_PREFIX)
+                    _attrs[aname] = a
+                    _attrsNS[(EMPTY_NAMESPACE, aname)] = a
+                a.ownerDocument = self.document
+                a.value = value
+                a.ownerElement = node
+
+    if __debug__:
+        # This only adds some asserts to the original
+        # end_element_handler(), so we only define this when -O is not
+        # used.  If changing one, be sure to check the other to see if
+        # it needs to be changed as well.
+        #
+        def end_element_handler(self, name):
+            curNode = self.curNode
+            if ' ' in name:
+                uri, localname, prefix, qname = _parse_ns_name(self, name)
+                assert (curNode.namespaceURI == uri
+                        and curNode.localName == localname
+                        and curNode.prefix == prefix), \
+                        "element stack messed up! (namespace)"
+            else:
+                assert curNode.nodeName == name, \
+                       "element stack messed up - bad nodeName"
+                assert curNode.namespaceURI == EMPTY_NAMESPACE, \
+                       "element stack messed up - bad namespaceURI"
+            self.curNode = curNode.parentNode
+            self._finish_end_element(curNode)
+
+
+class ExpatBuilderNS(Namespaces, ExpatBuilder):
+    """Document builder that supports namespaces."""
+
+    def reset(self):
+        ExpatBuilder.reset(self)
+        self._initNamespaces()
+
+
+class FragmentBuilderNS(Namespaces, FragmentBuilder):
+    """Fragment builder that supports namespaces."""
+
+    def reset(self):
+        FragmentBuilder.reset(self)
+        self._initNamespaces()
+
+    def _getNSattrs(self):
+        """Return string of namespace attributes from this element and
+        ancestors."""
+        # XXX This needs to be re-written to walk the ancestors of the
+        # context to build up the namespace information from
+        # declarations, elements, and attributes found in context.
+        # Otherwise we have to store a bunch more data on the DOM
+        # (though that *might* be more reliable -- not clear).
+        attrs = ""
+        context = self.context
+        L = []
+        while context:
+            if hasattr(context, '_ns_prefix_uri'):
+                for prefix, uri in context._ns_prefix_uri.items():
+                    # add every new NS decl from context to L and attrs string
+                    if prefix in L:
+                        continue
+                    L.append(prefix)
+                    if prefix:
+                        declname = "xmlns:" + prefix
+                    else:
+                        declname = "xmlns"
+                    if attrs:
+                        attrs = "%s\n    %s='%s'" % (attrs, declname, uri)
+                    else:
+                        attrs = " %s='%s'" % (declname, uri)
+            context = context.parentNode
+        return attrs
+
+
+class ParseEscape(Exception):
+    """Exception raised to short-circuit parsing in InternalSubsetExtractor."""
+    pass
+
+class InternalSubsetExtractor(ExpatBuilder):
+    """XML processor which can rip out the internal document type subset."""
+
+    subset = None
+
+    def getSubset(self):
+        """Return the internal subset as a string."""
+        return self.subset
+
+    def parseFile(self, file):
+        try:
+            ExpatBuilder.parseFile(self, file)
+        except ParseEscape:
+            pass
+
+    def parseString(self, string):
+        try:
+            ExpatBuilder.parseString(self, string)
+        except ParseEscape:
+            pass
+
+    def install(self, parser):
+        parser.StartDoctypeDeclHandler = self.start_doctype_decl_handler
+        parser.StartElementHandler = self.start_element_handler
+
+    def start_doctype_decl_handler(self, name, publicId, systemId,
+                                   has_internal_subset):
+        if has_internal_subset:
+            parser = self.getParser()
+            self.subset = []
+            parser.DefaultHandler = self.subset.append
+            parser.EndDoctypeDeclHandler = self.end_doctype_decl_handler
+        else:
+            raise ParseEscape()
+
+    def end_doctype_decl_handler(self):
+        s = ''.join(self.subset).replace('\r\n', '\n').replace('\r', '\n')
+        self.subset = s
+        raise ParseEscape()
+
+    def start_element_handler(self, name, attrs):
+        raise ParseEscape()
+
+
+def parse(file, namespaces=True):
+    """Parse a document, returning the resulting Document node.
+
+    'file' may be either a file name or an open file object.
+    """
+    if namespaces:
+        builder = ExpatBuilderNS()
+    else:
+        builder = ExpatBuilder()
+
+    if isinstance(file, str):
+        with open(file, 'rb') as fp:
+            result = builder.parseFile(fp)
+    else:
+        result = builder.parseFile(file)
+    return result
+
+
+def parseString(string, namespaces=True):
+    """Parse a document from a string, returning the resulting
+    Document node.
+    """
+    if namespaces:
+        builder = ExpatBuilderNS()
+    else:
+        builder = ExpatBuilder()
+    return builder.parseString(string)
+
+
+def parseFragment(file, context, namespaces=True):
+    """Parse a fragment of a document, given the context from which it
+    was originally extracted.  context should be the parent of the
+    node(s) which are in the fragment.
+
+    'file' may be either a file name or an open file object.
+    """
+    if namespaces:
+        builder = FragmentBuilderNS(context)
+    else:
+        builder = FragmentBuilder(context)
+
+    if isinstance(file, str):
+        with open(file, 'rb') as fp:
+            result = builder.parseFile(fp)
+    else:
+        result = builder.parseFile(file)
+    return result
+
+
+def parseFragmentString(string, context, namespaces=True):
+    """Parse a fragment of a document from a string, given the context
+    from which it was originally extracted.  context should be the
+    parent of the node(s) which are in the fragment.
+    """
+    if namespaces:
+        builder = FragmentBuilderNS(context)
+    else:
+        builder = FragmentBuilder(context)
+    return builder.parseString(string)
+
+
+def makeBuilder(options):
+    """Create a builder based on an Options object."""
+    if options.namespaces:
+        return ExpatBuilderNS(options)
+    else:
+        return ExpatBuilder(options)
diff --git a/modules/language/python/module/xml/dom/minicompat.py b/modules/language/python/module/xml/dom/minicompat.py
new file mode 100644
index 0000000..fa1bad3
--- /dev/null
+++ b/modules/language/python/module/xml/dom/minicompat.py
@@ -0,0 +1,111 @@
+module(xml,dom,minicompat)
+
+"""Python version compatibility support for minidom.
+
+This module contains internal implementation details and
+should not be imported; use xml.dom.minidom instead.
+"""
+
+# This module should only be imported using "import *".
+#
+# The following names are defined:
+#
+#   NodeList      -- lightest possible NodeList implementation
+#
+#   EmptyNodeList -- lightest possible NodeList that is guaranteed to
+#                    remain empty (immutable)
+#
+#   StringTypes   -- tuple of defined string types
+#
+#   defproperty   -- function used in conjunction with GetattrMagic;
+#                    using these together is needed to make them work
+#                    as efficiently as possible in both Python 2.2+
+#                    and older versions.  For example:
+#
+#                        class MyClass(GetattrMagic):
+#                            def _get_myattr(self):
+#                                return something
+#
+#                        defproperty(MyClass, "myattr",
+#                                    "return some value")
+#
+#                    For Python 2.2 and newer, this will construct a
+#                    property object on the class, which avoids
+#                    needing to override __getattr__().  It will only
+#                    work for read-only attributes.
+#
+#                    For older versions of Python, inheriting from
+#                    GetattrMagic will use the traditional
+#                    __getattr__() hackery to achieve the same effect,
+#                    but less efficiently.
+#
+#                    defproperty() should be used for each version of
+#                    the relevant _get_<property>() function.
+
+__all__ = ["NodeList", "EmptyNodeList", "StringTypes", "defproperty"]
+
+import xml.dom
+
+StringTypes = (str,)
+
+
+class NodeList(list):
+    __slots__ = ()
+
+    def item(self, index):
+        if 0 <= index < len(self):
+            return self[index]
+
+    def _get_length(self):
+        return len(self)
+
+    def _set_length(self, value):
+        raise xml.dom.NoModificationAllowedErr(
+            "attempt to modify read-only attribute 'length'")
+
+    length = property(_get_length, _set_length,
+                      doc="The number of nodes in the NodeList.")
+
+    # For backward compatibility
+    def __setstate__(self, state):
+        if state is None:
+            state = []
+        self[:] = state
+
+
+class EmptyNodeList(tuple):
+    __slots__ = ()
+
+    def __add__(self, other):
+        NL = NodeList()
+        NL.extend(other)
+        return NL
+
+    def __radd__(self, other):
+        NL = NodeList()
+        NL.extend(other)
+        return NL
+
+    def item(self, index):
+        return None
+
+    def _get_length(self):
+        return 0
+
+    def _set_length(self, value):
+        raise xml.dom.NoModificationAllowedErr(
+            "attempt to modify read-only attribute 'length'")
+
+    length = property(_get_length, _set_length,
+                      doc="The number of nodes in the NodeList.")
+
+
+def defproperty(klass, name, doc):
+    get = getattr(klass, ("_get_" + name))
+    def set(self, value, name=name):
+        raise xml.dom.NoModificationAllowedErr(
+            "attempt to modify read-only attribute " + repr(name))
+    assert not hasattr(klass, "_set_" + name), \
+           "expected not to find _set_" + name
+    prop = property(get, set, doc=doc)
+    setattr(klass, name, prop)
diff --git a/modules/language/python/module/xml/dom/minidom.py b/modules/language/python/module/xml/dom/minidom.py
new file mode 100644
index 0000000..a5d813f
--- /dev/null
+++ b/modules/language/python/module/xml/dom/minidom.py
@@ -0,0 +1,1981 @@
+"""Simple implementation of the Level 1 DOM.
+
+Namespaces and other minor Level 2 features are also supported.
+
+parse("foo.xml")
+
+parseString("<foo><bar/></foo>")
+
+Todo:
+=====
+ * convenience methods for getting elements and text.
+ * more testing
+ * bring some of the writer and linearizer code into conformance with this
+        interface
+ * SAX 2 namespaces
+"""
+
+import io
+import xml.dom
+
+from xml.dom import EMPTY_NAMESPACE, EMPTY_PREFIX, XMLNS_NAMESPACE, domreg
+from xml.dom.minicompat import *
+from xml.dom.xmlbuilder import DOMImplementationLS, DocumentLS
+
+# This is used by the ID-cache invalidation checks; the list isn't
+# actually complete, since the nodes being checked will never be the
+# DOCUMENT_NODE or DOCUMENT_FRAGMENT_NODE.  (The node being checked is
+# the node being added or removed, not the node being modified.)
+#
+_nodeTypes_with_children = (xml.dom.Node.ELEMENT_NODE,
+                            xml.dom.Node.ENTITY_REFERENCE_NODE)
+
+
+class Node(xml.dom.Node):
+    namespaceURI = None # this is non-null only for elements and attributes
+    parentNode = None
+    ownerDocument = None
+    nextSibling = None
+    previousSibling = None
+
+    prefix = EMPTY_PREFIX # non-null only for NS elements and attributes
+
+    def __bool__(self):
+        return True
+
+    def toxml(self, encoding=None):
+        return self.toprettyxml("", "", encoding)
+
+    def toprettyxml(self, indent="\t", newl="\n", encoding=None):
+        if encoding is None:
+            writer = io.StringIO()
+        else:
+            writer = io.TextIOWrapper(io.BytesIO(),
+                                      encoding=encoding,
+                                      errors="xmlcharrefreplace",
+                                      newline='\n')
+        if self.nodeType == Node.DOCUMENT_NODE:
+            # Can pass encoding only to document, to put it into XML header
+            self.writexml(writer, "", indent, newl, encoding)
+        else:
+            self.writexml(writer, "", indent, newl)
+        if encoding is None:
+            return writer.getvalue()
+        else:
+            return writer.detach().getvalue()
+
+    def hasChildNodes(self):
+        return bool(self.childNodes)
+
+    def _get_childNodes(self):
+        return self.childNodes
+
+    def _get_firstChild(self):
+        if self.childNodes:
+            return self.childNodes[0]
+
+    def _get_lastChild(self):
+        if self.childNodes:
+            return self.childNodes[-1]
+
+    def insertBefore(self, newChild, refChild):
+        if newChild.nodeType == self.DOCUMENT_FRAGMENT_NODE:
+            for c in tuple(newChild.childNodes):
+                self.insertBefore(c, refChild)
+            ### The DOM does not clearly specify what to return in this case
+            return newChild
+        if newChild.nodeType not in self._child_node_types:
+            raise xml.dom.HierarchyRequestErr(
+                "%s cannot be child of %s" % (repr(newChild), repr(self)))
+        if newChild.parentNode is not None:
+            newChild.parentNode.removeChild(newChild)
+        if refChild is None:
+            self.appendChild(newChild)
+        else:
+            try:
+                index = self.childNodes.index(refChild)
+            except ValueError:
+                raise xml.dom.NotFoundErr()
+            if newChild.nodeType in _nodeTypes_with_children:
+                _clear_id_cache(self)
+            self.childNodes.insert(index, newChild)
+            newChild.nextSibling = refChild
+            refChild.previousSibling = newChild
+            if index:
+                node = self.childNodes[index-1]
+                node.nextSibling = newChild
+                newChild.previousSibling = node
+            else:
+                newChild.previousSibling = None
+            newChild.parentNode = self
+        return newChild
+
+    def appendChild(self, node):
+        if node.nodeType == self.DOCUMENT_FRAGMENT_NODE:
+            for c in tuple(node.childNodes):
+                self.appendChild(c)
+            ### The DOM does not clearly specify what to return in this case
+            return node
+        if node.nodeType not in self._child_node_types:
+            raise xml.dom.HierarchyRequestErr(
+                "%s cannot be child of %s" % (repr(node), repr(self)))
+        elif node.nodeType in _nodeTypes_with_children:
+            _clear_id_cache(self)
+        if node.parentNode is not None:
+            node.parentNode.removeChild(node)
+        _append_child(self, node)
+        node.nextSibling = None
+        return node
+
+    def replaceChild(self, newChild, oldChild):
+        if newChild.nodeType == self.DOCUMENT_FRAGMENT_NODE:
+            refChild = oldChild.nextSibling
+            self.removeChild(oldChild)
+            return self.insertBefore(newChild, refChild)
+        if newChild.nodeType not in self._child_node_types:
+            raise xml.dom.HierarchyRequestErr(
+                "%s cannot be child of %s" % (repr(newChild), repr(self)))
+        if newChild is oldChild:
+            return
+        if newChild.parentNode is not None:
+            newChild.parentNode.removeChild(newChild)
+        try:
+            index = self.childNodes.index(oldChild)
+        except ValueError:
+            raise xml.dom.NotFoundErr()
+        self.childNodes[index] = newChild
+        newChild.parentNode = self
+        oldChild.parentNode = None
+        if (newChild.nodeType in _nodeTypes_with_children
+            or oldChild.nodeType in _nodeTypes_with_children):
+            _clear_id_cache(self)
+        newChild.nextSibling = oldChild.nextSibling
+        newChild.previousSibling = oldChild.previousSibling
+        oldChild.nextSibling = None
+        oldChild.previousSibling = None
+        if newChild.previousSibling:
+            newChild.previousSibling.nextSibling = newChild
+        if newChild.nextSibling:
+            newChild.nextSibling.previousSibling = newChild
+        return oldChild
+
+    def removeChild(self, oldChild):
+        try:
+            self.childNodes.remove(oldChild)
+        except ValueError:
+            raise xml.dom.NotFoundErr()
+        if oldChild.nextSibling is not None:
+            oldChild.nextSibling.previousSibling = oldChild.previousSibling
+        if oldChild.previousSibling is not None:
+            oldChild.previousSibling.nextSibling = oldChild.nextSibling
+        oldChild.nextSibling = oldChild.previousSibling = None
+        if oldChild.nodeType in _nodeTypes_with_children:
+            _clear_id_cache(self)
+
+        oldChild.parentNode = None
+        return oldChild
+
+    def normalize(self):
+        L = []
+        for child in self.childNodes:
+            if child.nodeType == Node.TEXT_NODE:
+                if not child.data:
+                    # empty text node; discard
+                    if L:
+                        L[-1].nextSibling = child.nextSibling
+                    if child.nextSibling:
+                        child.nextSibling.previousSibling = child.previousSibling
+                    child.unlink()
+                elif L and L[-1].nodeType == child.nodeType:
+                    # collapse text node
+                    node = L[-1]
+                    node.data = node.data + child.data
+                    node.nextSibling = child.nextSibling
+                    if child.nextSibling:
+                        child.nextSibling.previousSibling = node
+                    child.unlink()
+                else:
+                    L.append(child)
+            else:
+                L.append(child)
+                if child.nodeType == Node.ELEMENT_NODE:
+                    child.normalize()
+        self.childNodes[:] = L
+
+    def cloneNode(self, deep):
+        return _clone_node(self, deep, self.ownerDocument or self)
+
+    def isSupported(self, feature, version):
+        return self.ownerDocument.implementation.hasFeature(feature, version)
+
+    def _get_localName(self):
+        # Overridden in Element and Attr where localName can be Non-Null
+        return None
+
+    # Node interfaces from Level 3 (WD 9 April 2002)
+
+    def isSameNode(self, other):
+        return self is other
+
+    def getInterface(self, feature):
+        if self.isSupported(feature, None):
+            return self
+        else:
+            return None
+
+    # The "user data" functions use a dictionary that is only present
+    # if some user data has been set, so be careful not to assume it
+    # exists.
+
+    def getUserData(self, key):
+        try:
+            return self._user_data[key][0]
+        except (AttributeError, KeyError):
+            return None
+
+    def setUserData(self, key, data, handler):
+        old = None
+        try:
+            d = self._user_data
+        except AttributeError:
+            d = {}
+            self._user_data = d
+        if key in d:
+            old = d[key][0]
+        if data is None:
+            # ignore handlers passed for None
+            handler = None
+            if old is not None:
+                del d[key]
+        else:
+            d[key] = (data, handler)
+        return old
+
+    def _call_user_data_handler(self, operation, src, dst):
+        if hasattr(self, "_user_data"):
+            for key, (data, handler) in list(self._user_data.items()):
+                if handler is not None:
+                    handler.handle(operation, key, data, src, dst)
+
+    # minidom-specific API:
+
+    def unlink(self):
+        self.parentNode = self.ownerDocument = None
+        if self.childNodes:
+            for child in self.childNodes:
+                child.unlink()
+            self.childNodes = NodeList()
+        self.previousSibling = None
+        self.nextSibling = None
+
+    # A Node is its own context manager, to ensure that an unlink() call occurs.
+    # This is similar to how a file object works.
+    def __enter__(self):
+        return self
+
+    def __exit__(self, et, ev, tb):
+        self.unlink()
+
+defproperty(Node, "firstChild", doc="First child node, or None.")
+defproperty(Node, "lastChild",  doc="Last child node, or None.")
+defproperty(Node, "localName",  doc="Namespace-local name of this node.")
+
+
+def _append_child(self, node):
+    # fast path with less checks; usable by DOM builders if careful
+    childNodes = self.childNodes
+    if childNodes:
+        last = childNodes[-1]
+        node.previousSibling = last
+        last.nextSibling = node
+    childNodes.append(node)
+    node.parentNode = self
+
+def _in_document(node):
+    # return True iff node is part of a document tree
+    while node is not None:
+        if node.nodeType == Node.DOCUMENT_NODE:
+            return True
+        node = node.parentNode
+    return False
+
+def _write_data(writer, data):
+    "Writes datachars to writer."
+    if data:
+        data = data.replace("&", "&amp;").replace("<", "&lt;"). \
+                    replace("\"", "&quot;").replace(">", "&gt;")
+        writer.write(data)
+
+def _get_elements_by_tagName_helper(parent, name, rc):
+    for node in parent.childNodes:
+        if node.nodeType == Node.ELEMENT_NODE and \
+            (name == "*" or node.tagName == name):
+            rc.append(node)
+        _get_elements_by_tagName_helper(node, name, rc)
+    return rc
+
+def _get_elements_by_tagName_ns_helper(parent, nsURI, localName, rc):
+    for node in parent.childNodes:
+        if node.nodeType == Node.ELEMENT_NODE:
+            if ((localName == "*" or node.localName == localName) and
+                (nsURI == "*" or node.namespaceURI == nsURI)):
+                rc.append(node)
+            _get_elements_by_tagName_ns_helper(node, nsURI, localName, rc)
+    return rc
+
+class DocumentFragment(Node):
+    nodeType = Node.DOCUMENT_FRAGMENT_NODE
+    nodeName = "#document-fragment"
+    nodeValue = None
+    attributes = None
+    parentNode = None
+    _child_node_types = (Node.ELEMENT_NODE,
+                         Node.TEXT_NODE,
+                         Node.CDATA_SECTION_NODE,
+                         Node.ENTITY_REFERENCE_NODE,
+                         Node.PROCESSING_INSTRUCTION_NODE,
+                         Node.COMMENT_NODE,
+                         Node.NOTATION_NODE)
+
+    def __init__(self):
+        self.childNodes = NodeList()
+
+
+class Attr(Node):
+    __slots__=('_name', '_value', 'namespaceURI',
+               '_prefix', 'childNodes', '_localName', 'ownerDocument', 'ownerElement')
+    nodeType = Node.ATTRIBUTE_NODE
+    attributes = None
+    specified = False
+    _is_id = False
+
+    _child_node_types = (Node.TEXT_NODE, Node.ENTITY_REFERENCE_NODE)
+
+    def __init__(self, qName, namespaceURI=EMPTY_NAMESPACE, localName=None,
+                 prefix=None):
+        self.ownerElement = None
+        self._name = qName
+        self.namespaceURI = namespaceURI
+        self._prefix = prefix
+        self.childNodes = NodeList()
+
+        # Add the single child node that represents the value of the attr
+        self.childNodes.append(Text())
+
+        # nodeValue and value are set elsewhere
+
+    def _get_localName(self):
+        try:
+            return self._localName
+        except AttributeError:
+            return self.nodeName.split(":", 1)[-1]
+
+    def _get_specified(self):
+        return self.specified
+
+    def _get_name(self):
+        return self._name
+
+    def _set_name(self, value):
+        self._name = value
+        if self.ownerElement is not None:
+            _clear_id_cache(self.ownerElement)
+
+    nodeName = name = property(_get_name, _set_name)
+
+    def _get_value(self):
+        return self._value
+
+    def _set_value(self, value):
+        self._value = value
+        self.childNodes[0].data = value
+        if self.ownerElement is not None:
+            _clear_id_cache(self.ownerElement)
+        self.childNodes[0].data = value
+
+    nodeValue = value = property(_get_value, _set_value)
+
+    def _get_prefix(self):
+        return self._prefix
+
+    def _set_prefix(self, prefix):
+        nsuri = self.namespaceURI
+        if prefix == "xmlns":
+            if nsuri and nsuri != XMLNS_NAMESPACE:
+                raise xml.dom.NamespaceErr(
+                    "illegal use of 'xmlns' prefix for the wrong namespace")
+        self._prefix = prefix
+        if prefix is None:
+            newName = self.localName
+        else:
+            newName = "%s:%s" % (prefix, self.localName)
+        if self.ownerElement:
+            _clear_id_cache(self.ownerElement)
+        self.name = newName
+
+    prefix = property(_get_prefix, _set_prefix)
+
+    def unlink(self):
+        # This implementation does not call the base implementation
+        # since most of that is not needed, and the expense of the
+        # method call is not warranted.  We duplicate the removal of
+        # children, but that's all we needed from the base class.
+        elem = self.ownerElement
+        if elem is not None:
+            del elem._attrs[self.nodeName]
+            del elem._attrsNS[(self.namespaceURI, self.localName)]
+            if self._is_id:
+                self._is_id = False
+                elem._magic_id_nodes -= 1
+                self.ownerDocument._magic_id_count -= 1
+        for child in self.childNodes:
+            child.unlink()
+        del self.childNodes[:]
+
+    def _get_isId(self):
+        if self._is_id:
+            return True
+        doc = self.ownerDocument
+        elem = self.ownerElement
+        if doc is None or elem is None:
+            return False
+
+        info = doc._get_elem_info(elem)
+        if info is None:
+            return False
+        if self.namespaceURI:
+            return info.isIdNS(self.namespaceURI, self.localName)
+        else:
+            return info.isId(self.nodeName)
+
+    def _get_schemaType(self):
+        doc = self.ownerDocument
+        elem = self.ownerElement
+        if doc is None or elem is None:
+            return _no_type
+
+        info = doc._get_elem_info(elem)
+        if info is None:
+            return _no_type
+        if self.namespaceURI:
+            return info.getAttributeTypeNS(self.namespaceURI, self.localName)
+        else:
+            return info.getAttributeType(self.nodeName)
+
+defproperty(Attr, "isId",       doc="True if this attribute is an ID.")
+defproperty(Attr, "localName",  doc="Namespace-local name of this attribute.")
+defproperty(Attr, "schemaType", doc="Schema type for this attribute.")
+
+
+class NamedNodeMap(object):
+    """The attribute list is a transient interface to the underlying
+    dictionaries.  Mutations here will change the underlying element's
+    dictionary.
+
+    Ordering is imposed artificially and does not reflect the order of
+    attributes as found in an input document.
+    """
+
+    __slots__ = ('_attrs', '_attrsNS', '_ownerElement')
+
+    def __init__(self, attrs, attrsNS, ownerElement):
+        self._attrs = attrs
+        self._attrsNS = attrsNS
+        self._ownerElement = ownerElement
+
+    def _get_length(self):
+        return len(self._attrs)
+
+    def item(self, index):
+        try:
+            return self[list(self._attrs.keys())[index]]
+        except IndexError:
+            return None
+
+    def items(self):
+        L = []
+        for node in self._attrs.values():
+            L.append((node.nodeName, node.value))
+        return L
+
+    def itemsNS(self):
+        L = []
+        for node in self._attrs.values():
+            L.append(((node.namespaceURI, node.localName), node.value))
+        return L
+
+    def __contains__(self, key):
+        if isinstance(key, str):
+            return key in self._attrs
+        else:
+            return key in self._attrsNS
+
+    def keys(self):
+        return self._attrs.keys()
+
+    def keysNS(self):
+        return self._attrsNS.keys()
+
+    def values(self):
+        return self._attrs.values()
+
+    def get(self, name, value=None):
+        return self._attrs.get(name, value)
+
+    __len__ = _get_length
+
+    def _cmp(self, other):
+        if self._attrs is getattr(other, "_attrs", None):
+            return 0
+        else:
+            return (id(self) > id(other)) - (id(self) < id(other))
+
+    def __eq__(self, other):
+        return self._cmp(other) == 0
+
+    def __ge__(self, other):
+        return self._cmp(other) >= 0
+
+    def __gt__(self, other):
+        return self._cmp(other) > 0
+
+    def __le__(self, other):
+        return self._cmp(other) <= 0
+
+    def __lt__(self, other):
+        return self._cmp(other) < 0
+
+    def __getitem__(self, attname_or_tuple):
+        if isinstance(attname_or_tuple, tuple):
+            return self._attrsNS[attname_or_tuple]
+        else:
+            return self._attrs[attname_or_tuple]
+
+    # same as set
+    def __setitem__(self, attname, value):
+        if isinstance(value, str):
+            try:
+                node = self._attrs[attname]
+            except KeyError:
+                node = Attr(attname)
+                node.ownerDocument = self._ownerElement.ownerDocument
+                self.setNamedItem(node)
+            node.value = value
+        else:
+            if not isinstance(value, Attr):
+                raise TypeError("value must be a string or Attr object")
+            node = value
+            self.setNamedItem(node)
+
+    def getNamedItem(self, name):
+        try:
+            return self._attrs[name]
+        except KeyError:
+            return None
+
+    def getNamedItemNS(self, namespaceURI, localName):
+        try:
+            return self._attrsNS[(namespaceURI, localName)]
+        except KeyError:
+            return None
+
+    def removeNamedItem(self, name):
+        n = self.getNamedItem(name)
+        if n is not None:
+            _clear_id_cache(self._ownerElement)
+            del self._attrs[n.nodeName]
+            del self._attrsNS[(n.namespaceURI, n.localName)]
+            if hasattr(n, 'ownerElement'):
+                n.ownerElement = None
+            return n
+        else:
+            raise xml.dom.NotFoundErr()
+
+    def removeNamedItemNS(self, namespaceURI, localName):
+        n = self.getNamedItemNS(namespaceURI, localName)
+        if n is not None:
+            _clear_id_cache(self._ownerElement)
+            del self._attrsNS[(n.namespaceURI, n.localName)]
+            del self._attrs[n.nodeName]
+            if hasattr(n, 'ownerElement'):
+                n.ownerElement = None
+            return n
+        else:
+            raise xml.dom.NotFoundErr()
+
+    def setNamedItem(self, node):
+        if not isinstance(node, Attr):
+            raise xml.dom.HierarchyRequestErr(
+                "%s cannot be child of %s" % (repr(node), repr(self)))
+        old = self._attrs.get(node.name)
+        if old:
+            old.unlink()
+        self._attrs[node.name] = node
+        self._attrsNS[(node.namespaceURI, node.localName)] = node
+        node.ownerElement = self._ownerElement
+        _clear_id_cache(node.ownerElement)
+        return old
+
+    def setNamedItemNS(self, node):
+        return self.setNamedItem(node)
+
+    def __delitem__(self, attname_or_tuple):
+        node = self[attname_or_tuple]
+        _clear_id_cache(node.ownerElement)
+        node.unlink()
+
+    def __getstate__(self):
+        return self._attrs, self._attrsNS, self._ownerElement
+
+    def __setstate__(self, state):
+        self._attrs, self._attrsNS, self._ownerElement = state
+
+defproperty(NamedNodeMap, "length",
+            doc="Number of nodes in the NamedNodeMap.")
+
+AttributeList = NamedNodeMap
+
+
+class TypeInfo(object):
+    __slots__ = 'namespace', 'name'
+
+    def __init__(self, namespace, name):
+        self.namespace = namespace
+        self.name = name
+
+    def __repr__(self):
+        if self.namespace:
+            return "<%s %r (from %r)>" % (self.__class__.__name__, self.name,
+                                          self.namespace)
+        else:
+            return "<%s %r>" % (self.__class__.__name__, self.name)
+
+    def _get_name(self):
+        return self.name
+
+    def _get_namespace(self):
+        return self.namespace
+
+_no_type = TypeInfo(None, None)
+
+class Element(Node):
+    __slots__=('ownerDocument', 'parentNode', 'tagName', 'nodeName', 'prefix',
+               'namespaceURI', '_localName', 'childNodes', '_attrs', '_attrsNS',
+               'nextSibling', 'previousSibling')
+    nodeType = Node.ELEMENT_NODE
+    nodeValue = None
+    schemaType = _no_type
+
+    _magic_id_nodes = 0
+
+    _child_node_types = (Node.ELEMENT_NODE,
+                         Node.PROCESSING_INSTRUCTION_NODE,
+                         Node.COMMENT_NODE,
+                         Node.TEXT_NODE,
+                         Node.CDATA_SECTION_NODE,
+                         Node.ENTITY_REFERENCE_NODE)
+
+    def __init__(self, tagName, namespaceURI=EMPTY_NAMESPACE, prefix=None,
+                 localName=None):
+        self.parentNode = None
+        self.tagName = self.nodeName = tagName
+        self.prefix = prefix
+        self.namespaceURI = namespaceURI
+        self.childNodes = NodeList()
+        self.nextSibling = self.previousSibling = None
+
+        # Attribute dictionaries are lazily created
+        # attributes are double-indexed:
+        #    tagName -> Attribute
+        #    URI,localName -> Attribute
+        # in the future: consider lazy generation
+        # of attribute objects this is too tricky
+        # for now because of headaches with
+        # namespaces.
+        self._attrs = None
+        self._attrsNS = None
+
+    def _ensure_attributes(self):
+        if self._attrs is None:
+            self._attrs = {}
+            self._attrsNS = {}
+
+    def _get_localName(self):
+        try:
+            return self._localName
+        except AttributeError:
+            return self.tagName.split(":", 1)[-1]
+
+    def _get_tagName(self):
+        return self.tagName
+
+    def unlink(self):
+        if self._attrs is not None:
+            for attr in list(self._attrs.values()):
+                attr.unlink()
+        self._attrs = None
+        self._attrsNS = None
+        Node.unlink(self)
+
+    def getAttribute(self, attname):
+        if self._attrs is None:
+            return ""
+        try:
+            return self._attrs[attname].value
+        except KeyError:
+            return ""
+
+    def getAttributeNS(self, namespaceURI, localName):
+        if self._attrsNS is None:
+            return ""
+        try:
+            return self._attrsNS[(namespaceURI, localName)].value
+        except KeyError:
+            return ""
+
+    def setAttribute(self, attname, value):
+        attr = self.getAttributeNode(attname)
+        if attr is None:
+            attr = Attr(attname)
+            attr.value = value # also sets nodeValue
+            attr.ownerDocument = self.ownerDocument
+            self.setAttributeNode(attr)
+        elif value != attr.value:
+            attr.value = value
+            if attr.isId:
+                _clear_id_cache(self)
+
+    def setAttributeNS(self, namespaceURI, qualifiedName, value):
+        prefix, localname = _nssplit(qualifiedName)
+        attr = self.getAttributeNodeNS(namespaceURI, localname)
+        if attr is None:
+            attr = Attr(qualifiedName, namespaceURI, localname, prefix)
+            attr.value = value
+            attr.ownerDocument = self.ownerDocument
+            self.setAttributeNode(attr)
+        else:
+            if value != attr.value:
+                attr.value = value
+                if attr.isId:
+                    _clear_id_cache(self)
+            if attr.prefix != prefix:
+                attr.prefix = prefix
+                attr.nodeName = qualifiedName
+
+    def getAttributeNode(self, attrname):
+        if self._attrs is None:
+            return None
+        return self._attrs.get(attrname)
+
+    def getAttributeNodeNS(self, namespaceURI, localName):
+        if self._attrsNS is None:
+            return None
+        return self._attrsNS.get((namespaceURI, localName))
+
+    def setAttributeNode(self, attr):
+        if attr.ownerElement not in (None, self):
+            raise xml.dom.InuseAttributeErr("attribute node already owned")
+        self._ensure_attributes()
+        old1 = self._attrs.get(attr.name, None)
+        if old1 is not None:
+            self.removeAttributeNode(old1)
+        old2 = self._attrsNS.get((attr.namespaceURI, attr.localName), None)
+        if old2 is not None and old2 is not old1:
+            self.removeAttributeNode(old2)
+        _set_attribute_node(self, attr)
+
+        if old1 is not attr:
+            # It might have already been part of this node, in which case
+            # it doesn't represent a change, and should not be returned.
+            return old1
+        if old2 is not attr:
+            return old2
+
+    setAttributeNodeNS = setAttributeNode
+
+    def removeAttribute(self, name):
+        if self._attrsNS is None:
+            raise xml.dom.NotFoundErr()
+        try:
+            attr = self._attrs[name]
+        except KeyError:
+            raise xml.dom.NotFoundErr()
+        self.removeAttributeNode(attr)
+
+    def removeAttributeNS(self, namespaceURI, localName):
+        if self._attrsNS is None:
+            raise xml.dom.NotFoundErr()
+        try:
+            attr = self._attrsNS[(namespaceURI, localName)]
+        except KeyError:
+            raise xml.dom.NotFoundErr()
+        self.removeAttributeNode(attr)
+
+    def removeAttributeNode(self, node):
+        if node is None:
+            raise xml.dom.NotFoundErr()
+        try:
+            self._attrs[node.name]
+        except KeyError:
+            raise xml.dom.NotFoundErr()
+        _clear_id_cache(self)
+        node.unlink()
+        # Restore this since the node is still useful and otherwise
+        # unlinked
+        node.ownerDocument = self.ownerDocument
+
+    removeAttributeNodeNS = removeAttributeNode
+
+    def hasAttribute(self, name):
+        if self._attrs is None:
+            return False
+        return name in self._attrs
+
+    def hasAttributeNS(self, namespaceURI, localName):
+        if self._attrsNS is None:
+            return False
+        return (namespaceURI, localName) in self._attrsNS
+
+    def getElementsByTagName(self, name):
+        return _get_elements_by_tagName_helper(self, name, NodeList())
+
+    def getElementsByTagNameNS(self, namespaceURI, localName):
+        return _get_elements_by_tagName_ns_helper(
+            self, namespaceURI, localName, NodeList())
+
+    def __repr__(self):
+        return "<DOM Element: %s at %#x>" % (self.tagName, id(self))
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        # indent = current indentation
+        # addindent = indentation to add to higher levels
+        # newl = newline string
+        writer.write(indent+"<" + self.tagName)
+
+        attrs = self._get_attributes()
+        a_names = sorted(attrs.keys())
+
+        for a_name in a_names:
+            writer.write(" %s=\"" % a_name)
+            _write_data(writer, attrs[a_name].value)
+            writer.write("\"")
+        if self.childNodes:
+            writer.write(">")
+            if (len(self.childNodes) == 1 and
+                self.childNodes[0].nodeType == Node.TEXT_NODE):
+                self.childNodes[0].writexml(writer, '', '', '')
+            else:
+                writer.write(newl)
+                for node in self.childNodes:
+                    node.writexml(writer, indent+addindent, addindent, newl)
+                writer.write(indent)
+            writer.write("</%s>%s" % (self.tagName, newl))
+        else:
+            writer.write("/>%s"%(newl))
+
+    def _get_attributes(self):
+        self._ensure_attributes()
+        return NamedNodeMap(self._attrs, self._attrsNS, self)
+
+    def hasAttributes(self):
+        if self._attrs:
+            return True
+        else:
+            return False
+
+    # DOM Level 3 attributes, based on the 22 Oct 2002 draft
+
+    def setIdAttribute(self, name):
+        idAttr = self.getAttributeNode(name)
+        self.setIdAttributeNode(idAttr)
+
+    def setIdAttributeNS(self, namespaceURI, localName):
+        idAttr = self.getAttributeNodeNS(namespaceURI, localName)
+        self.setIdAttributeNode(idAttr)
+
+    def setIdAttributeNode(self, idAttr):
+        if idAttr is None or not self.isSameNode(idAttr.ownerElement):
+            raise xml.dom.NotFoundErr()
+        if _get_containing_entref(self) is not None:
+            raise xml.dom.NoModificationAllowedErr()
+        if not idAttr._is_id:
+            idAttr._is_id = True
+            self._magic_id_nodes += 1
+            self.ownerDocument._magic_id_count += 1
+            _clear_id_cache(self)
+
+defproperty(Element, "attributes",
+            doc="NamedNodeMap of attributes on the element.")
+defproperty(Element, "localName",
+            doc="Namespace-local name of this element.")
+
+
+def _set_attribute_node(element, attr):
+    _clear_id_cache(element)
+    element._ensure_attributes()
+    element._attrs[attr.name] = attr
+    element._attrsNS[(attr.namespaceURI, attr.localName)] = attr
+
+    # This creates a circular reference, but Element.unlink()
+    # breaks the cycle since the references to the attribute
+    # dictionaries are tossed.
+    attr.ownerElement = element
+
+class Childless:
+    """Mixin that makes childless-ness easy to implement and avoids
+    the complexity of the Node methods that deal with children.
+    """
+    __slots__ = ()
+
+    attributes = None
+    childNodes = EmptyNodeList()
+    firstChild = None
+    lastChild = None
+
+    def _get_firstChild(self):
+        return None
+
+    def _get_lastChild(self):
+        return None
+
+    def appendChild(self, node):
+        raise xml.dom.HierarchyRequestErr(
+            self.nodeName + " nodes cannot have children")
+
+    def hasChildNodes(self):
+        return False
+
+    def insertBefore(self, newChild, refChild):
+        raise xml.dom.HierarchyRequestErr(
+            self.nodeName + " nodes do not have children")
+
+    def removeChild(self, oldChild):
+        raise xml.dom.NotFoundErr(
+            self.nodeName + " nodes do not have children")
+
+    def normalize(self):
+        # For childless nodes, normalize() has nothing to do.
+        pass
+
+    def replaceChild(self, newChild, oldChild):
+        raise xml.dom.HierarchyRequestErr(
+            self.nodeName + " nodes do not have children")
+
+
+class ProcessingInstruction(Childless, Node):
+    nodeType = Node.PROCESSING_INSTRUCTION_NODE
+    __slots__ = ('target', 'data')
+
+    def __init__(self, target, data):
+        self.target = target
+        self.data = data
+
+    # nodeValue is an alias for data
+    def _get_nodeValue(self):
+        return self.data
+    def _set_nodeValue(self, value):
+        self.data = value
+    nodeValue = property(_get_nodeValue, _set_nodeValue)
+
+    # nodeName is an alias for target
+    def _get_nodeName(self):
+        return self.target
+    def _set_nodeName(self, value):
+        self.target = value
+    nodeName = property(_get_nodeName, _set_nodeName)
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        writer.write("%s<?%s %s?>%s" % (indent,self.target, self.data, newl))
+
+
+class CharacterData(Childless, Node):
+    __slots__=('_data', 'ownerDocument','parentNode', 'previousSibling', 'nextSibling')
+
+    def __init__(self):
+        self.ownerDocument = self.parentNode = None
+        self.previousSibling = self.nextSibling = None
+        self._data = ''
+        Node.__init__(self)
+
+    def _get_length(self):
+        return len(self.data)
+    __len__ = _get_length
+
+    def _get_data(self):
+        return self._data
+    def _set_data(self, data):
+        self._data = data
+
+    data = nodeValue = property(_get_data, _set_data)
+
+    def __repr__(self):
+        data = self.data
+        if len(data) > 10:
+            dotdotdot = "..."
+        else:
+            dotdotdot = ""
+        return '<DOM %s node "%r%s">' % (
+            self.__class__.__name__, data[0:10], dotdotdot)
+
+    def substringData(self, offset, count):
+        if offset < 0:
+            raise xml.dom.IndexSizeErr("offset cannot be negative")
+        if offset >= len(self.data):
+            raise xml.dom.IndexSizeErr("offset cannot be beyond end of data")
+        if count < 0:
+            raise xml.dom.IndexSizeErr("count cannot be negative")
+        return self.data[offset:offset+count]
+
+    def appendData(self, arg):
+        self.data = self.data + arg
+
+    def insertData(self, offset, arg):
+        if offset < 0:
+            raise xml.dom.IndexSizeErr("offset cannot be negative")
+        if offset >= len(self.data):
+            raise xml.dom.IndexSizeErr("offset cannot be beyond end of data")
+        if arg:
+            self.data = "%s%s%s" % (
+                self.data[:offset], arg, self.data[offset:])
+
+    def deleteData(self, offset, count):
+        if offset < 0:
+            raise xml.dom.IndexSizeErr("offset cannot be negative")
+        if offset >= len(self.data):
+            raise xml.dom.IndexSizeErr("offset cannot be beyond end of data")
+        if count < 0:
+            raise xml.dom.IndexSizeErr("count cannot be negative")
+        if count:
+            self.data = self.data[:offset] + self.data[offset+count:]
+
+    def replaceData(self, offset, count, arg):
+        if offset < 0:
+            raise xml.dom.IndexSizeErr("offset cannot be negative")
+        if offset >= len(self.data):
+            raise xml.dom.IndexSizeErr("offset cannot be beyond end of data")
+        if count < 0:
+            raise xml.dom.IndexSizeErr("count cannot be negative")
+        if count:
+            self.data = "%s%s%s" % (
+                self.data[:offset], arg, self.data[offset+count:])
+
+defproperty(CharacterData, "length", doc="Length of the string data.")
+
+
+class Text(CharacterData):
+    __slots__ = ()
+
+    nodeType = Node.TEXT_NODE
+    nodeName = "#text"
+    attributes = None
+
+    def splitText(self, offset):
+        if offset < 0 or offset > len(self.data):
+            raise xml.dom.IndexSizeErr("illegal offset value")
+        newText = self.__class__()
+        newText.data = self.data[offset:]
+        newText.ownerDocument = self.ownerDocument
+        next = self.nextSibling
+        if self.parentNode and self in self.parentNode.childNodes:
+            if next is None:
+                self.parentNode.appendChild(newText)
+            else:
+                self.parentNode.insertBefore(newText, next)
+        self.data = self.data[:offset]
+        return newText
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        _write_data(writer, "%s%s%s" % (indent, self.data, newl))
+
+    # DOM Level 3 (WD 9 April 2002)
+
+    def _get_wholeText(self):
+        L = [self.data]
+        n = self.previousSibling
+        while n is not None:
+            if n.nodeType in (Node.TEXT_NODE, Node.CDATA_SECTION_NODE):
+                L.insert(0, n.data)
+                n = n.previousSibling
+            else:
+                break
+        n = self.nextSibling
+        while n is not None:
+            if n.nodeType in (Node.TEXT_NODE, Node.CDATA_SECTION_NODE):
+                L.append(n.data)
+                n = n.nextSibling
+            else:
+                break
+        return ''.join(L)
+
+    def replaceWholeText(self, content):
+        # XXX This needs to be seriously changed if minidom ever
+        # supports EntityReference nodes.
+        parent = self.parentNode
+        n = self.previousSibling
+        while n is not None:
+            if n.nodeType in (Node.TEXT_NODE, Node.CDATA_SECTION_NODE):
+                next = n.previousSibling
+                parent.removeChild(n)
+                n = next
+            else:
+                break
+        n = self.nextSibling
+        if not content:
+            parent.removeChild(self)
+        while n is not None:
+            if n.nodeType in (Node.TEXT_NODE, Node.CDATA_SECTION_NODE):
+                next = n.nextSibling
+                parent.removeChild(n)
+                n = next
+            else:
+                break
+        if content:
+            self.data = content
+            return self
+        else:
+            return None
+
+    def _get_isWhitespaceInElementContent(self):
+        if self.data.strip():
+            return False
+        elem = _get_containing_element(self)
+        if elem is None:
+            return False
+        info = self.ownerDocument._get_elem_info(elem)
+        if info is None:
+            return False
+        else:
+            return info.isElementContent()
+
+defproperty(Text, "isWhitespaceInElementContent",
+            doc="True iff this text node contains only whitespace"
+                " and is in element content.")
+defproperty(Text, "wholeText",
+            doc="The text of all logically-adjacent text nodes.")
+
+
+def _get_containing_element(node):
+    c = node.parentNode
+    while c is not None:
+        if c.nodeType == Node.ELEMENT_NODE:
+            return c
+        c = c.parentNode
+    return None
+
+def _get_containing_entref(node):
+    c = node.parentNode
+    while c is not None:
+        if c.nodeType == Node.ENTITY_REFERENCE_NODE:
+            return c
+        c = c.parentNode
+    return None
+
+
+class Comment(CharacterData):
+    nodeType = Node.COMMENT_NODE
+    nodeName = "#comment"
+
+    def __init__(self, data):
+        CharacterData.__init__(self)
+        self._data = data
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        if "--" in self.data:
+            raise ValueError("'--' is not allowed in a comment node")
+        writer.write("%s<!--%s-->%s" % (indent, self.data, newl))
+
+
+class CDATASection(Text):
+    __slots__ = ()
+
+    nodeType = Node.CDATA_SECTION_NODE
+    nodeName = "#cdata-section"
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        if self.data.find("]]>") >= 0:
+            raise ValueError("']]>' not allowed in a CDATA section")
+        writer.write("<![CDATA[%s]]>" % self.data)
+
+
+class ReadOnlySequentialNamedNodeMap(object):
+    __slots__ = '_seq',
+
+    def __init__(self, seq=()):
+        # seq should be a list or tuple
+        self._seq = seq
+
+    def __len__(self):
+        return len(self._seq)
+
+    def _get_length(self):
+        return len(self._seq)
+
+    def getNamedItem(self, name):
+        for n in self._seq:
+            if n.nodeName == name:
+                return n
+
+    def getNamedItemNS(self, namespaceURI, localName):
+        for n in self._seq:
+            if n.namespaceURI == namespaceURI and n.localName == localName:
+                return n
+
+    def __getitem__(self, name_or_tuple):
+        if isinstance(name_or_tuple, tuple):
+            node = self.getNamedItemNS(*name_or_tuple)
+        else:
+            node = self.getNamedItem(name_or_tuple)
+        if node is None:
+            raise KeyError(name_or_tuple)
+        return node
+
+    def item(self, index):
+        if index < 0:
+            return None
+        try:
+            return self._seq[index]
+        except IndexError:
+            return None
+
+    def removeNamedItem(self, name):
+        raise xml.dom.NoModificationAllowedErr(
+            "NamedNodeMap instance is read-only")
+
+    def removeNamedItemNS(self, namespaceURI, localName):
+        raise xml.dom.NoModificationAllowedErr(
+            "NamedNodeMap instance is read-only")
+
+    def setNamedItem(self, node):
+        raise xml.dom.NoModificationAllowedErr(
+            "NamedNodeMap instance is read-only")
+
+    def setNamedItemNS(self, node):
+        raise xml.dom.NoModificationAllowedErr(
+            "NamedNodeMap instance is read-only")
+
+    def __getstate__(self):
+        return [self._seq]
+
+    def __setstate__(self, state):
+        self._seq = state[0]
+
+defproperty(ReadOnlySequentialNamedNodeMap, "length",
+            doc="Number of entries in the NamedNodeMap.")
+
+
+class Identified:
+    """Mix-in class that supports the publicId and systemId attributes."""
+
+    __slots__ = 'publicId', 'systemId'
+
+    def _identified_mixin_init(self, publicId, systemId):
+        self.publicId = publicId
+        self.systemId = systemId
+
+    def _get_publicId(self):
+        return self.publicId
+
+    def _get_systemId(self):
+        return self.systemId
+
+class DocumentType(Identified, Childless, Node):
+    nodeType = Node.DOCUMENT_TYPE_NODE
+    nodeValue = None
+    name = None
+    publicId = None
+    systemId = None
+    internalSubset = None
+
+    def __init__(self, qualifiedName):
+        self.entities = ReadOnlySequentialNamedNodeMap()
+        self.notations = ReadOnlySequentialNamedNodeMap()
+        if qualifiedName:
+            prefix, localname = _nssplit(qualifiedName)
+            self.name = localname
+        self.nodeName = self.name
+
+    def _get_internalSubset(self):
+        return self.internalSubset
+
+    def cloneNode(self, deep):
+        if self.ownerDocument is None:
+            # it's ok
+            clone = DocumentType(None)
+            clone.name = self.name
+            clone.nodeName = self.name
+            operation = xml.dom.UserDataHandler.NODE_CLONED
+            if deep:
+                clone.entities._seq = []
+                clone.notations._seq = []
+                for n in self.notations._seq:
+                    notation = Notation(n.nodeName, n.publicId, n.systemId)
+                    clone.notations._seq.append(notation)
+                    n._call_user_data_handler(operation, n, notation)
+                for e in self.entities._seq:
+                    entity = Entity(e.nodeName, e.publicId, e.systemId,
+                                    e.notationName)
+                    entity.actualEncoding = e.actualEncoding
+                    entity.encoding = e.encoding
+                    entity.version = e.version
+                    clone.entities._seq.append(entity)
+                    e._call_user_data_handler(operation, n, entity)
+            self._call_user_data_handler(operation, self, clone)
+            return clone
+        else:
+            return None
+
+    def writexml(self, writer, indent="", addindent="", newl=""):
+        writer.write("<!DOCTYPE ")
+        writer.write(self.name)
+        if self.publicId:
+            writer.write("%s  PUBLIC '%s'%s  '%s'"
+                         % (newl, self.publicId, newl, self.systemId))
+        elif self.systemId:
+            writer.write("%s  SYSTEM '%s'" % (newl, self.systemId))
+        if self.internalSubset is not None:
+            writer.write(" [")
+            writer.write(self.internalSubset)
+            writer.write("]")
+        writer.write(">"+newl)
+
+class Entity(Identified, Node):
+    attributes = None
+    nodeType = Node.ENTITY_NODE
+    nodeValue = None
+
+    actualEncoding = None
+    encoding = None
+    version = None
+
+    def __init__(self, name, publicId, systemId, notation):
+        self.nodeName = name
+        self.notationName = notation
+        self.childNodes = NodeList()
+        self._identified_mixin_init(publicId, systemId)
+
+    def _get_actualEncoding(self):
+        return self.actualEncoding
+
+    def _get_encoding(self):
+        return self.encoding
+
+    def _get_version(self):
+        return self.version
+
+    def appendChild(self, newChild):
+        raise xml.dom.HierarchyRequestErr(
+            "cannot append children to an entity node")
+
+    def insertBefore(self, newChild, refChild):
+        raise xml.dom.HierarchyRequestErr(
+            "cannot insert children below an entity node")
+
+    def removeChild(self, oldChild):
+        raise xml.dom.HierarchyRequestErr(
+            "cannot remove children from an entity node")
+
+    def replaceChild(self, newChild, oldChild):
+        raise xml.dom.HierarchyRequestErr(
+            "cannot replace children of an entity node")
+
+class Notation(Identified, Childless, Node):
+    nodeType = Node.NOTATION_NODE
+    nodeValue = None
+
+    def __init__(self, name, publicId, systemId):
+        self.nodeName = name
+        self._identified_mixin_init(publicId, systemId)
+
+
+class DOMImplementation(DOMImplementationLS):
+    _features = [("core", "1.0"),
+                 ("core", "2.0"),
+                 ("core", None),
+                 ("xml", "1.0"),
+                 ("xml", "2.0"),
+                 ("xml", None),
+                 ("ls-load", "3.0"),
+                 ("ls-load", None),
+                 ]
+
+    def hasFeature(self, feature, version):
+        if version == "":
+            version = None
+        return (feature.lower(), version) in self._features
+
+    def createDocument(self, namespaceURI, qualifiedName, doctype):
+        if doctype and doctype.parentNode is not None:
+            raise xml.dom.WrongDocumentErr(
+                "doctype object owned by another DOM tree")
+        doc = self._create_document()
+
+        add_root_element = not (namespaceURI is None
+                                and qualifiedName is None
+                                and doctype is None)
+
+        if not qualifiedName and add_root_element:
+            # The spec is unclear what to raise here; SyntaxErr
+            # would be the other obvious candidate. Since Xerces raises
+            # InvalidCharacterErr, and since SyntaxErr is not listed
+            # for createDocument, that seems to be the better choice.
+            # XXX: need to check for illegal characters here and in
+            # createElement.
+
+            # DOM Level III clears this up when talking about the return value
+            # of this function.  If namespaceURI, qName and DocType are
+            # Null the document is returned without a document element
+            # Otherwise if doctype or namespaceURI are not None
+            # Then we go back to the above problem
+            raise xml.dom.InvalidCharacterErr("Element with no name")
+
+        if add_root_element:
+            prefix, localname = _nssplit(qualifiedName)
+            if prefix == "xml" \
+               and namespaceURI != "http://www.w3.org/XML/1998/namespace":
+                raise xml.dom.NamespaceErr("illegal use of 'xml' prefix")
+            if prefix and not namespaceURI:
+                raise xml.dom.NamespaceErr(
+                    "illegal use of prefix without namespaces")
+            element = doc.createElementNS(namespaceURI, qualifiedName)
+            if doctype:
+                doc.appendChild(doctype)
+            doc.appendChild(element)
+
+        if doctype:
+            doctype.parentNode = doctype.ownerDocument = doc
+
+        doc.doctype = doctype
+        doc.implementation = self
+        return doc
+
+    def createDocumentType(self, qualifiedName, publicId, systemId):
+        doctype = DocumentType(qualifiedName)
+        doctype.publicId = publicId
+        doctype.systemId = systemId
+        return doctype
+
+    # DOM Level 3 (WD 9 April 2002)
+
+    def getInterface(self, feature):
+        if self.hasFeature(feature, None):
+            return self
+        else:
+            return None
+
+    # internal
+    def _create_document(self):
+        return Document()
+
+class ElementInfo(object):
+    """Object that represents content-model information for an element.
+
+    This implementation is not expected to be used in practice; DOM
+    builders should provide implementations which do the right thing
+    using information available to it.
+
+    """
+
+    __slots__ = 'tagName',
+
+    def __init__(self, name):
+        self.tagName = name
+
+    def getAttributeType(self, aname):
+        return _no_type
+
+    def getAttributeTypeNS(self, namespaceURI, localName):
+        return _no_type
+
+    def isElementContent(self):
+        return False
+
+    def isEmpty(self):
+        """Returns true iff this element is declared to have an EMPTY
+        content model."""
+        return False
+
+    def isId(self, aname):
+        """Returns true iff the named attribute is a DTD-style ID."""
+        return False
+
+    def isIdNS(self, namespaceURI, localName):
+        """Returns true iff the identified attribute is a DTD-style ID."""
+        return False
+
+    def __getstate__(self):
+        return self.tagName
+
+    def __setstate__(self, state):
+        self.tagName = state
+
+def _clear_id_cache(node):
+    if node.nodeType == Node.DOCUMENT_NODE:
+        node._id_cache.clear()
+        node._id_search_stack = None
+    elif _in_document(node):
+        node.ownerDocument._id_cache.clear()
+        node.ownerDocument._id_search_stack= None
+
+class Document(Node, DocumentLS):
+    __slots__ = ('_elem_info', 'doctype',
+                 '_id_search_stack', 'childNodes', '_id_cache')
+    _child_node_types = (Node.ELEMENT_NODE, Node.PROCESSING_INSTRUCTION_NODE,
+                         Node.COMMENT_NODE, Node.DOCUMENT_TYPE_NODE)
+
+    implementation = DOMImplementation()
+    nodeType = Node.DOCUMENT_NODE
+    nodeName = "#document"
+    nodeValue = None
+    attributes = None
+    parentNode = None
+    previousSibling = nextSibling = None
+
+
+    # Document attributes from Level 3 (WD 9 April 2002)
+
+    actualEncoding = None
+    encoding = None
+    standalone = None
+    version = None
+    strictErrorChecking = False
+    errorHandler = None
+    documentURI = None
+
+    _magic_id_count = 0
+
+    def __init__(self):
+        self.doctype = None
+        self.childNodes = NodeList()
+        # mapping of (namespaceURI, localName) -> ElementInfo
+        #        and tagName -> ElementInfo
+        self._elem_info = {}
+        self._id_cache = {}
+        self._id_search_stack = None
+
+    def _get_elem_info(self, element):
+        if element.namespaceURI:
+            key = element.namespaceURI, element.localName
+        else:
+            key = element.tagName
+        return self._elem_info.get(key)
+
+    def _get_actualEncoding(self):
+        return self.actualEncoding
+
+    def _get_doctype(self):
+        return self.doctype
+
+    def _get_documentURI(self):
+        return self.documentURI
+
+    def _get_encoding(self):
+        return self.encoding
+
+    def _get_errorHandler(self):
+        return self.errorHandler
+
+    def _get_standalone(self):
+        return self.standalone
+
+    def _get_strictErrorChecking(self):
+        return self.strictErrorChecking
+
+    def _get_version(self):
+        return self.version
+
+    def appendChild(self, node):
+        if node.nodeType not in self._child_node_types:
+            raise xml.dom.HierarchyRequestErr(
+                "%s cannot be child of %s" % (repr(node), repr(self)))
+        if node.parentNode is not None:
+            # This needs to be done before the next test since this
+            # may *be* the document element, in which case it should
+            # end up re-ordered to the end.
+            node.parentNode.removeChild(node)
+
+        if node.nodeType == Node.ELEMENT_NODE \
+           and self._get_documentElement():
+            raise xml.dom.HierarchyRequestErr(
+                "two document elements disallowed")
+        return Node.appendChild(self, node)
+
+    def removeChild(self, oldChild):
+        try:
+            self.childNodes.remove(oldChild)
+        except ValueError:
+            raise xml.dom.NotFoundErr()
+        oldChild.nextSibling = oldChild.previousSibling = None
+        oldChild.parentNode = None
+        if self.documentElement is oldChild:
+            self.documentElement = None
+
+        return oldChild
+
+    def _get_documentElement(self):
+        for node in self.childNodes:
+            if node.nodeType == Node.ELEMENT_NODE:
+                return node
+
+    def unlink(self):
+        if self.doctype is not None:
+            self.doctype.unlink()
+            self.doctype = None
+        Node.unlink(self)
+
+    def cloneNode(self, deep):
+        if not deep:
+            return None
+        clone = self.implementation.createDocument(None, None, None)
+        clone.encoding = self.encoding
+        clone.standalone = self.standalone
+        clone.version = self.version
+        for n in self.childNodes:
+            childclone = _clone_node(n, deep, clone)
+            assert childclone.ownerDocument.isSameNode(clone)
+            clone.childNodes.append(childclone)
+            if childclone.nodeType == Node.DOCUMENT_NODE:
+                assert clone.documentElement is None
+            elif childclone.nodeType == Node.DOCUMENT_TYPE_NODE:
+                assert clone.doctype is None
+                clone.doctype = childclone
+            childclone.parentNode = clone
+        self._call_user_data_handler(xml.dom.UserDataHandler.NODE_CLONED,
+                                     self, clone)
+        return clone
+
+    def createDocumentFragment(self):
+        d = DocumentFragment()
+        d.ownerDocument = self
+        return d
+
+    def createElement(self, tagName):
+        e = Element(tagName)
+        e.ownerDocument = self
+        return e
+
+    def createTextNode(self, data):
+        if not isinstance(data, str):
+            raise TypeError("node contents must be a string")
+        t = Text()
+        t.data = data
+        t.ownerDocument = self
+        return t
+
+    def createCDATASection(self, data):
+        if not isinstance(data, str):
+            raise TypeError("node contents must be a string")
+        c = CDATASection()
+        c.data = data
+        c.ownerDocument = self
+        return c
+
+    def createComment(self, data):
+        c = Comment(data)
+        c.ownerDocument = self
+        return c
+
+    def createProcessingInstruction(self, target, data):
+        p = ProcessingInstruction(target, data)
+        p.ownerDocument = self
+        return p
+
+    def createAttribute(self, qName):
+        a = Attr(qName)
+        a.ownerDocument = self
+        a.value = ""
+        return a
+
+    def createElementNS(self, namespaceURI, qualifiedName):
+        prefix, localName = _nssplit(qualifiedName)
+        e = Element(qualifiedName, namespaceURI, prefix)
+        e.ownerDocument = self
+        return e
+
+    def createAttributeNS(self, namespaceURI, qualifiedName):
+        prefix, localName = _nssplit(qualifiedName)
+        a = Attr(qualifiedName, namespaceURI, localName, prefix)
+        a.ownerDocument = self
+        a.value = ""
+        return a
+
+    # A couple of implementation-specific helpers to create node types
+    # not supported by the W3C DOM specs:
+
+    def _create_entity(self, name, publicId, systemId, notationName):
+        e = Entity(name, publicId, systemId, notationName)
+        e.ownerDocument = self
+        return e
+
+    def _create_notation(self, name, publicId, systemId):
+        n = Notation(name, publicId, systemId)
+        n.ownerDocument = self
+        return n
+
+    def getElementById(self, id):
+        if id in self._id_cache:
+            return self._id_cache[id]
+        if not (self._elem_info or self._magic_id_count):
+            return None
+
+        stack = self._id_search_stack
+        if stack is None:
+            # we never searched before, or the cache has been cleared
+            stack = [self.documentElement]
+            self._id_search_stack = stack
+        elif not stack:
+            # Previous search was completed and cache is still valid;
+            # no matching node.
+            return None
+
+        result = None
+        while stack:
+            node = stack.pop()
+            # add child elements to stack for continued searching
+            stack.extend([child for child in node.childNodes
+                          if child.nodeType in _nodeTypes_with_children])
+            # check this node
+            info = self._get_elem_info(node)
+            if info:
+                # We have to process all ID attributes before
+                # returning in order to get all the attributes set to
+                # be IDs using Element.setIdAttribute*().
+                for attr in node.attributes.values():
+                    if attr.namespaceURI:
+                        if info.isIdNS(attr.namespaceURI, attr.localName):
+                            self._id_cache[attr.value] = node
+                            if attr.value == id:
+                                result = node
+                            elif not node._magic_id_nodes:
+                                break
+                    elif info.isId(attr.name):
+                        self._id_cache[attr.value] = node
+                        if attr.value == id:
+                            result = node
+                        elif not node._magic_id_nodes:
+                            break
+                    elif attr._is_id:
+                        self._id_cache[attr.value] = node
+                        if attr.value == id:
+                            result = node
+                        elif node._magic_id_nodes == 1:
+                            break
+            elif node._magic_id_nodes:
+                for attr in node.attributes.values():
+                    if attr._is_id:
+                        self._id_cache[attr.value] = node
+                        if attr.value == id:
+                            result = node
+            if result is not None:
+                break
+        return result
+
+    def getElementsByTagName(self, name):
+        return _get_elements_by_tagName_helper(self, name, NodeList())
+
+    def getElementsByTagNameNS(self, namespaceURI, localName):
+        return _get_elements_by_tagName_ns_helper(
+            self, namespaceURI, localName, NodeList())
+
+    def isSupported(self, feature, version):
+        return self.implementation.hasFeature(feature, version)
+
+    def importNode(self, node, deep):
+        if node.nodeType == Node.DOCUMENT_NODE:
+            raise xml.dom.NotSupportedErr("cannot import document nodes")
+        elif node.nodeType == Node.DOCUMENT_TYPE_NODE:
+            raise xml.dom.NotSupportedErr("cannot import document type nodes")
+        return _clone_node(node, deep, self)
+
+    def writexml(self, writer, indent="", addindent="", newl="", encoding=None):
+        if encoding is None:
+            writer.write('<?xml version="1.0" ?>'+newl)
+        else:
+            writer.write('<?xml version="1.0" encoding="%s"?>%s' % (
+                encoding, newl))
+        for node in self.childNodes:
+            node.writexml(writer, indent, addindent, newl)
+
+    # DOM Level 3 (WD 9 April 2002)
+
+    def renameNode(self, n, namespaceURI, name):
+        if n.ownerDocument is not self:
+            raise xml.dom.WrongDocumentErr(
+                "cannot rename nodes from other documents;\n"
+                "expected %s,\nfound %s" % (self, n.ownerDocument))
+        if n.nodeType not in (Node.ELEMENT_NODE, Node.ATTRIBUTE_NODE):
+            raise xml.dom.NotSupportedErr(
+                "renameNode() only applies to element and attribute nodes")
+        if namespaceURI != EMPTY_NAMESPACE:
+            if ':' in name:
+                prefix, localName = name.split(':', 1)
+                if (  prefix == "xmlns"
+                      and namespaceURI != xml.dom.XMLNS_NAMESPACE):
+                    raise xml.dom.NamespaceErr(
+                        "illegal use of 'xmlns' prefix")
+            else:
+                if (  name == "xmlns"
+                      and namespaceURI != xml.dom.XMLNS_NAMESPACE
+                      and n.nodeType == Node.ATTRIBUTE_NODE):
+                    raise xml.dom.NamespaceErr(
+                        "illegal use of the 'xmlns' attribute")
+                prefix = None
+                localName = name
+        else:
+            prefix = None
+            localName = None
+        if n.nodeType == Node.ATTRIBUTE_NODE:
+            element = n.ownerElement
+            if element is not None:
+                is_id = n._is_id
+                element.removeAttributeNode(n)
+        else:
+            element = None
+        n.prefix = prefix
+        n._localName = localName
+        n.namespaceURI = namespaceURI
+        n.nodeName = name
+        if n.nodeType == Node.ELEMENT_NODE:
+            n.tagName = name
+        else:
+            # attribute node
+            n.name = name
+            if element is not None:
+                element.setAttributeNode(n)
+                if is_id:
+                    element.setIdAttributeNode(n)
+        # It's not clear from a semantic perspective whether we should
+        # call the user data handlers for the NODE_RENAMED event since
+        # we're re-using the existing node.  The draft spec has been
+        # interpreted as meaning "no, don't call the handler unless a
+        # new node is created."
+        return n
+
+defproperty(Document, "documentElement",
+            doc="Top-level element of this document.")
+
+
+def _clone_node(node, deep, newOwnerDocument):
+    """
+    Clone a node and give it the new owner document.
+    Called by Node.cloneNode and Document.importNode
+    """
+    if node.ownerDocument.isSameNode(newOwnerDocument):
+        operation = xml.dom.UserDataHandler.NODE_CLONED
+    else:
+        operation = xml.dom.UserDataHandler.NODE_IMPORTED
+    if node.nodeType == Node.ELEMENT_NODE:
+        clone = newOwnerDocument.createElementNS(node.namespaceURI,
+                                                 node.nodeName)
+        for attr in node.attributes.values():
+            clone.setAttributeNS(attr.namespaceURI, attr.nodeName, attr.value)
+            a = clone.getAttributeNodeNS(attr.namespaceURI, attr.localName)
+            a.specified = attr.specified
+
+        if deep:
+            for child in node.childNodes:
+                c = _clone_node(child, deep, newOwnerDocument)
+                clone.appendChild(c)
+
+    elif node.nodeType == Node.DOCUMENT_FRAGMENT_NODE:
+        clone = newOwnerDocument.createDocumentFragment()
+        if deep:
+            for child in node.childNodes:
+                c = _clone_node(child, deep, newOwnerDocument)
+                clone.appendChild(c)
+
+    elif node.nodeType == Node.TEXT_NODE:
+        clone = newOwnerDocument.createTextNode(node.data)
+    elif node.nodeType == Node.CDATA_SECTION_NODE:
+        clone = newOwnerDocument.createCDATASection(node.data)
+    elif node.nodeType == Node.PROCESSING_INSTRUCTION_NODE:
+        clone = newOwnerDocument.createProcessingInstruction(node.target,
+                                                             node.data)
+    elif node.nodeType == Node.COMMENT_NODE:
+        clone = newOwnerDocument.createComment(node.data)
+    elif node.nodeType == Node.ATTRIBUTE_NODE:
+        clone = newOwnerDocument.createAttributeNS(node.namespaceURI,
+                                                   node.nodeName)
+        clone.specified = True
+        clone.value = node.value
+    elif node.nodeType == Node.DOCUMENT_TYPE_NODE:
+        assert node.ownerDocument is not newOwnerDocument
+        operation = xml.dom.UserDataHandler.NODE_IMPORTED
+        clone = newOwnerDocument.implementation.createDocumentType(
+            node.name, node.publicId, node.systemId)
+        clone.ownerDocument = newOwnerDocument
+        if deep:
+            clone.entities._seq = []
+            clone.notations._seq = []
+            for n in node.notations._seq:
+                notation = Notation(n.nodeName, n.publicId, n.systemId)
+                notation.ownerDocument = newOwnerDocument
+                clone.notations._seq.append(notation)
+                if hasattr(n, '_call_user_data_handler'):
+                    n._call_user_data_handler(operation, n, notation)
+            for e in node.entities._seq:
+                entity = Entity(e.nodeName, e.publicId, e.systemId,
+                                e.notationName)
+                entity.actualEncoding = e.actualEncoding
+                entity.encoding = e.encoding
+                entity.version = e.version
+                entity.ownerDocument = newOwnerDocument
+                clone.entities._seq.append(entity)
+                if hasattr(e, '_call_user_data_handler'):
+                    e._call_user_data_handler(operation, n, entity)
+    else:
+        # Note the cloning of Document and DocumentType nodes is
+        # implementation specific.  minidom handles those cases
+        # directly in the cloneNode() methods.
+        raise xml.dom.NotSupportedErr("Cannot clone node %s" % repr(node))
+
+    # Check for _call_user_data_handler() since this could conceivably
+    # used with other DOM implementations (one of the FourThought
+    # DOMs, perhaps?).
+    if hasattr(node, '_call_user_data_handler'):
+        node._call_user_data_handler(operation, node, clone)
+    return clone
+
+
+def _nssplit(qualifiedName):
+    fields = qualifiedName.split(':', 1)
+    if len(fields) == 2:
+        return fields
+    else:
+        return (None, fields[0])
+
+
+def _do_pulldom_parse(func, args, kwargs):
+    events = func(*args, **kwargs)
+    toktype, rootNode = events.getEvent()
+    events.expandNode(rootNode)
+    events.clear()
+    return rootNode
+
+def parse(file, parser=None, bufsize=None):
+    """Parse a file into a DOM by filename or file object."""
+    if parser is None and not bufsize:
+        from xml.dom import expatbuilder
+        return expatbuilder.parse(file)
+    else:
+        from xml.dom import pulldom
+        return _do_pulldom_parse(pulldom.parse, (file,),
+            {'parser': parser, 'bufsize': bufsize})
+
+def parseString(string, parser=None):
+    """Parse a file into a DOM from a string."""
+    if parser is None:
+        from xml.dom import expatbuilder
+        return expatbuilder.parseString(string)
+    else:
+        from xml.dom import pulldom
+        return _do_pulldom_parse(pulldom.parseString, (string,),
+                                 {'parser': parser})
+
+def getDOMImplementation(features=None):
+    if features:
+        if isinstance(features, str):
+            features = domreg._parse_feature_string(features)
+        for f, v in features:
+            if not Document.implementation.hasFeature(f, v):
+                return None
+    return Document.implementation
diff --git a/modules/language/python/module/xml/dom/pulldom.py b/modules/language/python/module/xml/dom/pulldom.py
new file mode 100644
index 0000000..9194376
--- /dev/null
+++ b/modules/language/python/module/xml/dom/pulldom.py
@@ -0,0 +1,344 @@
+module(xml,dom,pulldom)
+
+import xml.sax
+import xml.sax.handler
+
+START_ELEMENT = "START_ELEMENT"
+END_ELEMENT = "END_ELEMENT"
+COMMENT = "COMMENT"
+START_DOCUMENT = "START_DOCUMENT"
+END_DOCUMENT = "END_DOCUMENT"
+PROCESSING_INSTRUCTION = "PROCESSING_INSTRUCTION"
+IGNORABLE_WHITESPACE = "IGNORABLE_WHITESPACE"
+CHARACTERS = "CHARACTERS"
+
+class PullDOM(xml.sax.ContentHandler):
+    _locator = None
+    document = None
+
+    def __init__(self, documentFactory=None):
+        from xml.dom import XML_NAMESPACE
+        self.documentFactory = documentFactory
+        self.firstEvent = [None, None]
+        self.lastEvent = self.firstEvent
+        self.elementStack = []
+        self.push = self.elementStack.append
+        try:
+            self.pop = self.elementStack.pop
+        except AttributeError:
+            # use class' pop instead
+            pass
+        self._ns_contexts = [{XML_NAMESPACE:'xml'}] # contains uri -> prefix dicts
+        self._current_context = self._ns_contexts[-1]
+        self.pending_events = []
+
+    def pop(self):
+        result = self.elementStack[-1]
+        del self.elementStack[-1]
+        return result
+
+    def setDocumentLocator(self, locator):
+        self._locator = locator
+
+    def startPrefixMapping(self, prefix, uri):
+        if not hasattr(self, '_xmlns_attrs'):
+            self._xmlns_attrs = []
+        self._xmlns_attrs.append((prefix or 'xmlns', uri))
+        self._ns_contexts.append(self._current_context.copy())
+        self._current_context[uri] = prefix or None
+
+    def endPrefixMapping(self, prefix):
+        self._current_context = self._ns_contexts.pop()
+
+    def startElementNS(self, name, tagName , attrs):
+        # Retrieve xml namespace declaration attributes.
+        xmlns_uri = 'http://www.w3.org/2000/xmlns/'
+        xmlns_attrs = getattr(self, '_xmlns_attrs', None)
+        if xmlns_attrs is not None:
+            for aname, value in xmlns_attrs:
+                attrs._attrs[(xmlns_uri, aname)] = value
+            self._xmlns_attrs = []
+        uri, localname = name
+        if uri:
+            # When using namespaces, the reader may or may not
+            # provide us with the original name. If not, create
+            # *a* valid tagName from the current context.
+            if tagName is None:
+                prefix = self._current_context[uri]
+                if prefix:
+                    tagName = prefix + ":" + localname
+                else:
+                    tagName = localname
+            if self.document:
+                node = self.document.createElementNS(uri, tagName)
+            else:
+                node = self.buildDocument(uri, tagName)
+        else:
+            # When the tagname is not prefixed, it just appears as
+            # localname
+            if self.document:
+                node = self.document.createElement(localname)
+            else:
+                node = self.buildDocument(None, localname)
+
+        for aname,value in attrs.items():
+            a_uri, a_localname = aname
+            if a_uri == xmlns_uri:
+                if a_localname == 'xmlns':
+                    qname = a_localname
+                else:
+                    qname = 'xmlns:' + a_localname
+                attr = self.document.createAttributeNS(a_uri, qname)
+                node.setAttributeNodeNS(attr)
+            elif a_uri:
+                prefix = self._current_context[a_uri]
+                if prefix:
+                    qname = prefix + ":" + a_localname
+                else:
+                    qname = a_localname
+                attr = self.document.createAttributeNS(a_uri, qname)
+                node.setAttributeNodeNS(attr)
+            else:
+                attr = self.document.createAttribute(a_localname)
+                node.setAttributeNode(attr)
+            attr.value = value
+
+        self.lastEvent[1] = [(START_ELEMENT, node), None]
+        self.lastEvent = self.lastEvent[1]
+        self.push(node)
+
+    def endElementNS(self, name, tagName):
+        self.lastEvent[1] = [(END_ELEMENT, self.pop()), None]
+        self.lastEvent = self.lastEvent[1]
+
+    def startElement(self, name, attrs):
+        if self.document:
+            node = self.document.createElement(name)
+        else:
+            node = self.buildDocument(None, name)
+
+        for aname,value in attrs.items():
+            attr = self.document.createAttribute(aname)
+            attr.value = value
+            node.setAttributeNode(attr)
+
+        self.lastEvent[1] = [(START_ELEMENT, node), None]
+        self.lastEvent = self.lastEvent[1]
+        self.push(node)
+
+    def endElement(self, name):
+        self.lastEvent[1] = [(END_ELEMENT, self.pop()), None]
+        self.lastEvent = self.lastEvent[1]
+
+    def comment(self, s):
+        if self.document:
+            node = self.document.createComment(s)
+            self.lastEvent[1] = [(COMMENT, node), None]
+            self.lastEvent = self.lastEvent[1]
+        else:
+            event = [(COMMENT, s), None]
+            self.pending_events.append(event)
+
+    def processingInstruction(self, target, data):
+        if self.document:
+            node = self.document.createProcessingInstruction(target, data)
+            self.lastEvent[1] = [(PROCESSING_INSTRUCTION, node), None]
+            self.lastEvent = self.lastEvent[1]
+        else:
+            event = [(PROCESSING_INSTRUCTION, target, data), None]
+            self.pending_events.append(event)
+
+    def ignorableWhitespace(self, chars):
+        node = self.document.createTextNode(chars)
+        self.lastEvent[1] = [(IGNORABLE_WHITESPACE, node), None]
+        self.lastEvent = self.lastEvent[1]
+
+    def characters(self, chars):
+        node = self.document.createTextNode(chars)
+        self.lastEvent[1] = [(CHARACTERS, node), None]
+        self.lastEvent = self.lastEvent[1]
+
+    def startDocument(self):
+        if self.documentFactory is None:
+            import xml.dom.minidom
+            self.documentFactory = xml.dom.minidom.Document.implementation
+
+    def buildDocument(self, uri, tagname):
+        # Can't do that in startDocument, since we need the tagname
+        # XXX: obtain DocumentType
+        node = self.documentFactory.createDocument(uri, tagname, None)
+        self.document = node
+        self.lastEvent[1] = [(START_DOCUMENT, node), None]
+        self.lastEvent = self.lastEvent[1]
+        self.push(node)
+        # Put everything we have seen so far into the document
+        for e in self.pending_events:
+            if e[0][0] == PROCESSING_INSTRUCTION:
+                _,target,data = e[0]
+                n = self.document.createProcessingInstruction(target, data)
+                e[0] = (PROCESSING_INSTRUCTION, n)
+            elif e[0][0] == COMMENT:
+                n = self.document.createComment(e[0][1])
+                e[0] = (COMMENT, n)
+            else:
+                raise AssertionError("Unknown pending event ",e[0][0])
+            self.lastEvent[1] = e
+            self.lastEvent = e
+        self.pending_events = None
+        return node.firstChild
+
+    def endDocument(self):
+        self.lastEvent[1] = [(END_DOCUMENT, self.document), None]
+        self.pop()
+
+    def clear(self):
+        "clear(): Explicitly release parsing structures"
+        self.document = None
+
+class ErrorHandler:
+    def warning(self, exception):
+        print(exception)
+    def error(self, exception):
+        raise exception
+    def fatalError(self, exception):
+        raise exception
+
+class DOMEventStream:
+    def __init__(self, stream, parser, bufsize):
+        self.stream = stream
+        self.parser = parser
+        self.bufsize = bufsize
+        if not hasattr(self.parser, 'feed'):
+            self.getEvent = self._slurp
+        self.reset()
+
+    def reset(self):
+        self.pulldom = PullDOM()
+        # This content handler relies on namespace support
+        self.parser.setFeature(xml.sax.handler.feature_namespaces, 1)
+        self.parser.setContentHandler(self.pulldom)
+
+    def __getitem__(self, pos):
+        rc = self.getEvent()
+        if rc:
+            return rc
+        raise IndexError
+
+    def __next__(self):
+        rc = self.getEvent()
+        if rc:
+            return rc
+        raise StopIteration
+
+    def __iter__(self):
+        return self
+
+    def expandNode(self, node):
+        event = self.getEvent()
+        parents = [node]
+        while event:
+            token, cur_node = event
+            if cur_node is node:
+                return
+            if token != END_ELEMENT:
+                parents[-1].appendChild(cur_node)
+            if token == START_ELEMENT:
+                parents.append(cur_node)
+            elif token == END_ELEMENT:
+                del parents[-1]
+            event = self.getEvent()
+
+    def getEvent(self):
+        # use IncrementalParser interface, so we get the desired
+        # pull effect
+        if not self.pulldom.firstEvent[1]:
+            self.pulldom.lastEvent = self.pulldom.firstEvent
+        while not self.pulldom.firstEvent[1]:
+            buf = self.stream.read(self.bufsize)
+            if not buf:
+                self.parser.close()
+                return None
+            self.parser.feed(buf)
+        rc = self.pulldom.firstEvent[1][0]
+        self.pulldom.firstEvent[1] = self.pulldom.firstEvent[1][1]
+        return rc
+
+    def _slurp(self):
+        """ Fallback replacement for getEvent() using the
+            standard SAX2 interface, which means we slurp the
+            SAX events into memory (no performance gain, but
+            we are compatible to all SAX parsers).
+        """
+        self.parser.parse(self.stream)
+        self.getEvent = self._emit
+        return self._emit()
+
+    def _emit(self):
+        """ Fallback replacement for getEvent() that emits
+            the events that _slurp() read previously.
+        """
+        rc = self.pulldom.firstEvent[1][0]
+        self.pulldom.firstEvent[1] = self.pulldom.firstEvent[1][1]
+        return rc
+
+    def clear(self):
+        """clear(): Explicitly release parsing objects"""
+        self.pulldom.clear()
+        del self.pulldom
+        self.parser = None
+        self.stream = None
+
+class SAX2DOM(PullDOM):
+
+    def startElementNS(self, name, tagName , attrs):
+        PullDOM.startElementNS(self, name, tagName, attrs)
+        curNode = self.elementStack[-1]
+        parentNode = self.elementStack[-2]
+        parentNode.appendChild(curNode)
+
+    def startElement(self, name, attrs):
+        PullDOM.startElement(self, name, attrs)
+        curNode = self.elementStack[-1]
+        parentNode = self.elementStack[-2]
+        parentNode.appendChild(curNode)
+
+    def processingInstruction(self, target, data):
+        PullDOM.processingInstruction(self, target, data)
+        node = self.lastEvent[0][1]
+        parentNode = self.elementStack[-1]
+        parentNode.appendChild(node)
+
+    def ignorableWhitespace(self, chars):
+        PullDOM.ignorableWhitespace(self, chars)
+        node = self.lastEvent[0][1]
+        parentNode = self.elementStack[-1]
+        parentNode.appendChild(node)
+
+    def characters(self, chars):
+        PullDOM.characters(self, chars)
+        node = self.lastEvent[0][1]
+        parentNode = self.elementStack[-1]
+        parentNode.appendChild(node)
+
+
+default_bufsize = (2 ** 14) - 20
+
+def parse(stream_or_string, parser=None, bufsize=None):
+    if bufsize is None:
+        bufsize = default_bufsize
+    if isinstance(stream_or_string, str):
+        stream = open(stream_or_string, 'rb')
+    else:
+        stream = stream_or_string
+    if not parser:
+        parser = xml.sax.make_parser()
+    return DOMEventStream(stream, parser, bufsize)
+
+def parseString(string, parser=None):
+    from io import StringIO
+
+    bufsize = len(string)
+    buf = StringIO(string)
+    if not parser:
+        parser = xml.sax.make_parser()
+    return DOMEventStream(buf, parser, bufsize)
diff --git a/modules/language/python/module/xml/dom/xmlbuilder.py b/modules/language/python/module/xml/dom/xmlbuilder.py
new file mode 100644
index 0000000..a2a4d1b
--- /dev/null
+++ b/modules/language/python/module/xml/dom/xmlbuilder.py
@@ -0,0 +1,412 @@
+module(xml,dom,xmlbuilder)
+
+"""Implementation of the DOM Level 3 'LS-Load' feature."""
+
+import copy
+import warnings
+import xml.dom
+
+from xml.dom.NodeFilter import NodeFilter
+
+
+__all__ = ["DOMBuilder", "DOMEntityResolver", "DOMInputSource"]
+
+
+class Options:
+    """Features object that has variables set for each DOMBuilder feature.
+
+    The DOMBuilder class uses an instance of this class to pass settings to
+    the ExpatBuilder class.
+    """
+
+    # Note that the DOMBuilder class in LoadSave constrains which of these
+    # values can be set using the DOM Level 3 LoadSave feature.
+
+    namespaces = 1
+    namespace_declarations = True
+    validation = False
+    external_parameter_entities = True
+    external_general_entities = True
+    external_dtd_subset = True
+    validate_if_schema = False
+    validate = False
+    datatype_normalization = False
+    create_entity_ref_nodes = True
+    entities = True
+    whitespace_in_element_content = True
+    cdata_sections = True
+    comments = True
+    charset_overrides_xml_encoding = True
+    infoset = False
+    supported_mediatypes_only = False
+
+    errorHandler = None
+    filter = None
+
+
+class DOMBuilder:
+    entityResolver = None
+    errorHandler = None
+    filter = None
+
+    ACTION_REPLACE = 1
+    ACTION_APPEND_AS_CHILDREN = 2
+    ACTION_INSERT_AFTER = 3
+    ACTION_INSERT_BEFORE = 4
+
+    _legal_actions = (ACTION_REPLACE, ACTION_APPEND_AS_CHILDREN,
+                      ACTION_INSERT_AFTER, ACTION_INSERT_BEFORE)
+
+    def __init__(self):
+        self._options = Options()
+
+    def _get_entityResolver(self):
+        return self.entityResolver
+    def _set_entityResolver(self, entityResolver):
+        self.entityResolver = entityResolver
+
+    def _get_errorHandler(self):
+        return self.errorHandler
+    def _set_errorHandler(self, errorHandler):
+        self.errorHandler = errorHandler
+
+    def _get_filter(self):
+        return self.filter
+    def _set_filter(self, filter):
+        self.filter = filter
+
+    def setFeature(self, name, state):
+        if self.supportsFeature(name):
+            state = state and 1 or 0
+            try:
+                settings = self._settings[(_name_xform(name), state)]
+            except KeyError:
+                raise xml.dom.NotSupportedErr(
+                    "unsupported feature: %r" % (name,))
+            else:
+                for name, value in settings:
+                    setattr(self._options, name, value)
+        else:
+            raise xml.dom.NotFoundErr("unknown feature: " + repr(name))
+
+    def supportsFeature(self, name):
+        return hasattr(self._options, _name_xform(name))
+
+    def canSetFeature(self, name, state):
+        key = (_name_xform(name), state and 1 or 0)
+        return key in self._settings
+
+    # This dictionary maps from (feature,value) to a list of
+    # (option,value) pairs that should be set on the Options object.
+    # If a (feature,value) setting is not in this dictionary, it is
+    # not supported by the DOMBuilder.
+    #
+    _settings = {
+        ("namespace_declarations", 0): [
+            ("namespace_declarations", 0)],
+        ("namespace_declarations", 1): [
+            ("namespace_declarations", 1)],
+        ("validation", 0): [
+            ("validation", 0)],
+        ("external_general_entities", 0): [
+            ("external_general_entities", 0)],
+        ("external_general_entities", 1): [
+            ("external_general_entities", 1)],
+        ("external_parameter_entities", 0): [
+            ("external_parameter_entities", 0)],
+        ("external_parameter_entities", 1): [
+            ("external_parameter_entities", 1)],
+        ("validate_if_schema", 0): [
+            ("validate_if_schema", 0)],
+        ("create_entity_ref_nodes", 0): [
+            ("create_entity_ref_nodes", 0)],
+        ("create_entity_ref_nodes", 1): [
+            ("create_entity_ref_nodes", 1)],
+        ("entities", 0): [
+            ("create_entity_ref_nodes", 0),
+            ("entities", 0)],
+        ("entities", 1): [
+            ("entities", 1)],
+        ("whitespace_in_element_content", 0): [
+            ("whitespace_in_element_content", 0)],
+        ("whitespace_in_element_content", 1): [
+            ("whitespace_in_element_content", 1)],
+        ("cdata_sections", 0): [
+            ("cdata_sections", 0)],
+        ("cdata_sections", 1): [
+            ("cdata_sections", 1)],
+        ("comments", 0): [
+            ("comments", 0)],
+        ("comments", 1): [
+            ("comments", 1)],
+        ("charset_overrides_xml_encoding", 0): [
+            ("charset_overrides_xml_encoding", 0)],
+        ("charset_overrides_xml_encoding", 1): [
+            ("charset_overrides_xml_encoding", 1)],
+        ("infoset", 0): [],
+        ("infoset", 1): [
+            ("namespace_declarations", 0),
+            ("validate_if_schema", 0),
+            ("create_entity_ref_nodes", 0),
+            ("entities", 0),
+            ("cdata_sections", 0),
+            ("datatype_normalization", 1),
+            ("whitespace_in_element_content", 1),
+            ("comments", 1),
+            ("charset_overrides_xml_encoding", 1)],
+        ("supported_mediatypes_only", 0): [
+            ("supported_mediatypes_only", 0)],
+        ("namespaces", 0): [
+            ("namespaces", 0)],
+        ("namespaces", 1): [
+            ("namespaces", 1)],
+    }
+
+    def getFeature(self, name):
+        xname = _name_xform(name)
+        try:
+            return getattr(self._options, xname)
+        except AttributeError:
+            if name == "infoset":
+                options = self._options
+                return (options.datatype_normalization
+                        and options.whitespace_in_element_content
+                        and options.comments
+                        and options.charset_overrides_xml_encoding
+                        and not (options.namespace_declarations
+                                 or options.validate_if_schema
+                                 or options.create_entity_ref_nodes
+                                 or options.entities
+                                 or options.cdata_sections))
+            raise xml.dom.NotFoundErr("feature %s not known" % repr(name))
+
+    def parseURI(self, uri):
+        if self.entityResolver:
+            input = self.entityResolver.resolveEntity(None, uri)
+        else:
+            input = DOMEntityResolver().resolveEntity(None, uri)
+        return self.parse(input)
+
+    def parse(self, input):
+        options = copy.copy(self._options)
+        options.filter = self.filter
+        options.errorHandler = self.errorHandler
+        fp = input.byteStream
+        if fp is None and options.systemId:
+            import urllib.request
+            fp = urllib.request.urlopen(input.systemId)
+        return self._parse_bytestream(fp, options)
+
+    def parseWithContext(self, input, cnode, action):
+        if action not in self._legal_actions:
+            raise ValueError("not a legal action")
+        raise NotImplementedError("Haven't written this yet...")
+
+    def _parse_bytestream(self, stream, options):
+        import xml.dom.expatbuilder
+        builder = xml.dom.expatbuilder.makeBuilder(options)
+        return builder.parseFile(stream)
+
+
+def _name_xform(name):
+    return name.lower().replace('-', '_')
+
+
+class DOMEntityResolver(object):
+    __slots__ = '_opener',
+
+    def resolveEntity(self, publicId, systemId):
+        assert systemId is not None
+        source = DOMInputSource()
+        source.publicId = publicId
+        source.systemId = systemId
+        source.byteStream = self._get_opener().open(systemId)
+
+        # determine the encoding if the transport provided it
+        source.encoding = self._guess_media_encoding(source)
+
+        # determine the base URI is we can
+        import posixpath, urllib.parse
+        parts = urllib.parse.urlparse(systemId)
+        scheme, netloc, path, params, query, fragment = parts
+        # XXX should we check the scheme here as well?
+        if path and not path.endswith("/"):
+            path = posixpath.dirname(path) + "/"
+            parts = scheme, netloc, path, params, query, fragment
+            source.baseURI = urllib.parse.urlunparse(parts)
+
+        return source
+
+    def _get_opener(self):
+        try:
+            return self._opener
+        except AttributeError:
+            self._opener = self._create_opener()
+            return self._opener
+
+    def _create_opener(self):
+        import urllib.request
+        return urllib.request.build_opener()
+
+    def _guess_media_encoding(self, source):
+        info = source.byteStream.info()
+        if "Content-Type" in info:
+            for param in info.getplist():
+                if param.startswith("charset="):
+                    return param.split("=", 1)[1].lower()
+
+
+class DOMInputSource(object):
+    __slots__ = ('byteStream', 'characterStream', 'stringData',
+                 'encoding', 'publicId', 'systemId', 'baseURI')
+
+    def __init__(self):
+        self.byteStream = None
+        self.characterStream = None
+        self.stringData = None
+        self.encoding = None
+        self.publicId = None
+        self.systemId = None
+        self.baseURI = None
+
+    def _get_byteStream(self):
+        return self.byteStream
+    def _set_byteStream(self, byteStream):
+        self.byteStream = byteStream
+
+    def _get_characterStream(self):
+        return self.characterStream
+    def _set_characterStream(self, characterStream):
+        self.characterStream = characterStream
+
+    def _get_stringData(self):
+        return self.stringData
+    def _set_stringData(self, data):
+        self.stringData = data
+
+    def _get_encoding(self):
+        return self.encoding
+    def _set_encoding(self, encoding):
+        self.encoding = encoding
+
+    def _get_publicId(self):
+        return self.publicId
+    def _set_publicId(self, publicId):
+        self.publicId = publicId
+
+    def _get_systemId(self):
+        return self.systemId
+    def _set_systemId(self, systemId):
+        self.systemId = systemId
+
+    def _get_baseURI(self):
+        return self.baseURI
+    def _set_baseURI(self, uri):
+        self.baseURI = uri
+
+
+class DOMBuilderFilter:
+    """Element filter which can be used to tailor construction of
+    a DOM instance.
+    """
+
+    # There's really no need for this class; concrete implementations
+    # should just implement the endElement() and startElement()
+    # methods as appropriate.  Using this makes it easy to only
+    # implement one of them.
+
+    FILTER_ACCEPT = 1
+    FILTER_REJECT = 2
+    FILTER_SKIP = 3
+    FILTER_INTERRUPT = 4
+
+    whatToShow = NodeFilter.SHOW_ALL
+
+    def _get_whatToShow(self):
+        return self.whatToShow
+
+    def acceptNode(self, element):
+        return self.FILTER_ACCEPT
+
+    def startContainer(self, element):
+        return self.FILTER_ACCEPT
+
+del NodeFilter
+
+
+class _AsyncDeprecatedProperty:
+    def warn(self, cls):
+        clsname = cls.__name__
+        warnings.warn(
+            "{cls}.async is deprecated; use {cls}.async_".format(cls=clsname),
+            DeprecationWarning)
+
+    def __get__(self, instance, cls):
+        self.warn(cls)
+        if instance is not None:
+            return instance.async_
+        return False
+
+    def __set__(self, instance, value):
+        self.warn(type(instance))
+        setattr(instance, 'async_', value)
+
+
+class DocumentLS:
+    """Mixin to create documents that conform to the load/save spec."""
+
+    async_ = False
+    locals()['async'] = _AsyncDeprecatedProperty()  # Avoid DeprecationWarning
+
+    def _get_async(self):
+        return False
+
+    def _set_async(self, flag):
+        if flag:
+            raise xml.dom.NotSupportedErr(
+                "asynchronous document loading is not supported")
+
+    def abort(self):
+        # What does it mean to "clear" a document?  Does the
+        # documentElement disappear?
+        raise NotImplementedError(
+            "haven't figured out what this means yet")
+
+    def load(self, uri):
+        raise NotImplementedError("haven't written this yet")
+
+    def loadXML(self, source):
+        raise NotImplementedError("haven't written this yet")
+
+    def saveXML(self, snode):
+        if snode is None:
+            snode = self
+        elif snode.ownerDocument is not self:
+            raise xml.dom.WrongDocumentErr()
+        return snode.toxml()
+
+
+del _AsyncDeprecatedProperty
+
+
+class DOMImplementationLS:
+    MODE_SYNCHRONOUS = 1
+    MODE_ASYNCHRONOUS = 2
+
+    def createDOMBuilder(self, mode, schemaType):
+        if schemaType is not None:
+            raise xml.dom.NotSupportedErr(
+                "schemaType not yet supported")
+        if mode == self.MODE_SYNCHRONOUS:
+            return DOMBuilder()
+        if mode == self.MODE_ASYNCHRONOUS:
+            raise xml.dom.NotSupportedErr(
+                "asynchronous builders are not supported")
+        raise ValueError("unknown value for mode")
+
+    def createDOMWriter(self):
+        raise NotImplementedError(
+            "the writer interface hasn't been written yet!")
+
+    def createDOMInputSource(self):
+        return DOMInputSource()
diff --git a/modules/language/python/module/xml/etree.py b/modules/language/python/module/xml/etree.py
new file mode 100644
index 0000000..2f733a3
--- /dev/null
+++ b/modules/language/python/module/xml/etree.py
@@ -0,0 +1,38 @@
+module(xml,etree)
+
+# $Id: __init__.py 3375 2008-02-13 08:05:08Z fredrik $
+# elementtree package
+
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2008 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
+import xml.etree.ElementTree as ElementTree
+import xml.etree.ElementPath as ElementPath
+import xml.etree.ElementInclude as ElementInclude
diff --git a/modules/language/python/module/xml/etree/ElementInclude.py b/modules/language/python/module/xml/etree/ElementInclude.py
new file mode 100644
index 0000000..ed4b682
--- /dev/null
+++ b/modules/language/python/module/xml/etree/ElementInclude.py
@@ -0,0 +1,145 @@
+module(xml,etree,ElementInclude)
+
+#
+# ElementTree
+# $Id: ElementInclude.py 3375 2008-02-13 08:05:08Z fredrik $
+#
+# limited xinclude support for element trees
+#
+# history:
+# 2003-08-15 fl   created
+# 2003-11-14 fl   fixed default loader
+#
+# Copyright (c) 2003-2004 by Fredrik Lundh.  All rights reserved.
+#
+# fredrik@pythonware.com
+# http://www.pythonware.com
+#
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2008 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
+
+##
+# Limited XInclude support for the ElementTree package.
+##
+
+import copy
+from . import ElementTree
+
+XINCLUDE = "{http://www.w3.org/2001/XInclude}"
+
+XINCLUDE_INCLUDE = XINCLUDE + "include"
+XINCLUDE_FALLBACK = XINCLUDE + "fallback"
+
+##
+# Fatal include error.
+
+class FatalIncludeError(SyntaxError):
+    pass
+
+##
+# Default loader.  This loader reads an included resource from disk.
+#
+# @param href Resource reference.
+# @param parse Parse mode.  Either "xml" or "text".
+# @param encoding Optional text encoding (UTF-8 by default for "text").
+# @return The expanded resource.  If the parse mode is "xml", this
+#    is an ElementTree instance.  If the parse mode is "text", this
+#    is a Unicode string.  If the loader fails, it can return None
+#    or raise an OSError exception.
+# @throws OSError If the loader fails to load the resource.
+
+def default_loader(href, parse, encoding=None):
+    if parse == "xml":
+        with open(href, 'rb') as file:
+            data = ElementTree.parse(file).getroot()
+    else:
+        if not encoding:
+            encoding = 'UTF-8'
+        with open(href, 'r', encoding=encoding) as file:
+            data = file.read()
+    return data
+
+##
+# Expand XInclude directives.
+#
+# @param elem Root element.
+# @param loader Optional resource loader.  If omitted, it defaults
+#     to {@link default_loader}.  If given, it should be a callable
+#     that implements the same interface as <b>default_loader</b>.
+# @throws FatalIncludeError If the function fails to include a given
+#     resource, or if the tree contains malformed XInclude elements.
+# @throws OSError If the function fails to load a given resource.
+
+def include(elem, loader=None):
+    if loader is None:
+        loader = default_loader
+    # look for xinclude elements
+    i = 0
+    while i < len(elem):
+        e = elem[i]
+        if e.tag == XINCLUDE_INCLUDE:
+            # process xinclude directive
+            href = e.get("href")
+            parse = e.get("parse", "xml")
+            if parse == "xml":
+                node = loader(href, parse)
+                if node is None:
+                    raise FatalIncludeError(
+                        "cannot load %r as %r" % (href, parse)
+                        )
+                node = copy.copy(node)
+                if e.tail:
+                    node.tail = (node.tail or "") + e.tail
+                elem[i] = node
+            elif parse == "text":
+                text = loader(href, parse, e.get("encoding"))
+                if text is None:
+                    raise FatalIncludeError(
+                        "cannot load %r as %r" % (href, parse)
+                        )
+                if i:
+                    node = elem[i-1]
+                    node.tail = (node.tail or "") + text + (e.tail or "")
+                else:
+                    elem.text = (elem.text or "") + text + (e.tail or "")
+                del elem[i]
+                continue
+            else:
+                raise FatalIncludeError(
+                    "unknown parse type in xi:include tag (%r)" % parse
+                )
+        elif e.tag == XINCLUDE_FALLBACK:
+            raise FatalIncludeError(
+                "xi:fallback tag must be child of xi:include (%r)" % e.tag
+                )
+        else:
+            include(e, loader)
+        i = i + 1
diff --git a/modules/language/python/module/xml/etree/ElementPath.py b/modules/language/python/module/xml/etree/ElementPath.py
new file mode 100644
index 0000000..9e6993f
--- /dev/null
+++ b/modules/language/python/module/xml/etree/ElementPath.py
@@ -0,0 +1,316 @@
+module(xml,etree,ElementPath)
+
+#
+# ElementTree
+# $Id: ElementPath.py 3375 2008-02-13 08:05:08Z fredrik $
+#
+# limited xpath support for element trees
+#
+# history:
+# 2003-05-23 fl   created
+# 2003-05-28 fl   added support for // etc
+# 2003-08-27 fl   fixed parsing of periods in element names
+# 2007-09-10 fl   new selection engine
+# 2007-09-12 fl   fixed parent selector
+# 2007-09-13 fl   added iterfind; changed findall to return a list
+# 2007-11-30 fl   added namespaces support
+# 2009-10-30 fl   added child element value filter
+#
+# Copyright (c) 2003-2009 by Fredrik Lundh.  All rights reserved.
+#
+# fredrik@pythonware.com
+# http://www.pythonware.com
+#
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2009 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
+
+##
+# Implementation module for XPath support.  There's usually no reason
+# to import this module directly; the <b>ElementTree</b> does this for
+# you, if needed.
+##
+
+import re
+
+xpath_tokenizer_re = re.compile(
+    r"("
+    r"'[^']*'|\"[^\"]*\"|"
+    r"::|"
+    r"//?|"
+    r"\.\.|"
+    r"\(\)|"
+    r"[/.*:\[\]\(\)@=])|"
+    r"((?:\{[^}]+\})?[^/\[\]\(\)@=\s]+)|"
+    r"\s+"
+    )
+
+def xpath_tokenizer(pattern, namespaces=None):
+    for token in xpath_tokenizer_re.findall(pattern):
+        tag = token[1]
+        if tag and tag[0] != "{" and ":" in tag:
+            try:
+                prefix, uri = tag.split(":", 1)
+                if not namespaces:
+                    raise KeyError
+                yield token[0], "{%s}%s" % (namespaces[prefix], uri)
+            except KeyError:
+                raise SyntaxError("prefix %r not found in prefix map" % prefix)
+        else:
+            yield token
+
+def get_parent_map(context):
+    parent_map = context.parent_map
+    if parent_map is None:
+        context.parent_map = parent_map = {}
+        for p in context.root.iter():
+            for e in p:
+                parent_map[e] = p
+    return parent_map
+
+def prepare_child(next, token):
+    tag = token[1]
+    def select(context, result):
+        for elem in result:
+            for e in elem:
+                if e.tag == tag:
+                    yield e
+    return select
+
+def prepare_star(next, token):
+    def select(context, result):
+        for elem in result:
+            yield from elem
+    return select
+
+def prepare_self(next, token):
+    def select(context, result):
+        yield from result
+    return select
+
+def prepare_descendant(next, token):
+    try:
+        token = next()
+    except StopIteration:
+        return
+    if token[0] == "*":
+        tag = "*"
+    elif not token[0]:
+        tag = token[1]
+    else:
+        raise SyntaxError("invalid descendant")
+    def select(context, result):
+        for elem in result:
+            for e in elem.iter(tag):
+                if e is not elem:
+                    yield e
+    return select
+
+def prepare_parent(next, token):
+    def select(context, result):
+        # FIXME: raise error if .. is applied at toplevel?
+        parent_map = get_parent_map(context)
+        result_map = {}
+        for elem in result:
+            if elem in parent_map:
+                parent = parent_map[elem]
+                if parent not in result_map:
+                    result_map[parent] = None
+                    yield parent
+    return select
+
+def prepare_predicate(next, token):
+    # FIXME: replace with real parser!!! refs:
+    # http://effbot.org/zone/simple-iterator-parser.htm
+    # http://javascript.crockford.com/tdop/tdop.html
+    signature = []
+    predicate = []
+    while 1:
+        try:
+            token = next()
+        except StopIteration:
+            return
+        if token[0] == "]":
+            break
+        if token[0] and token[0][:1] in "'\"":
+            token = "'", token[0][1:-1]
+        signature.append(token[0] or "-")
+        predicate.append(token[1])
+    signature = "".join(signature)
+    # use signature to determine predicate type
+    if signature == "@-":
+        # [@attribute] predicate
+        key = predicate[1]
+        def select(context, result):
+            for elem in result:
+                if elem.get(key) is not None:
+                    yield elem
+        return select
+    if signature == "@-='":
+        # [@attribute='value']
+        key = predicate[1]
+        value = predicate[-1]
+        def select(context, result):
+            for elem in result:
+                if elem.get(key) == value:
+                    yield elem
+        return select
+    if signature == "-" and not re.match(r"\-?\d+$", predicate[0]):
+        # [tag]
+        tag = predicate[0]
+        def select(context, result):
+            for elem in result:
+                if elem.find(tag) is not None:
+                    yield elem
+        return select
+    if signature == "-='" and not re.match(r"\-?\d+$", predicate[0]):
+        # [tag='value']
+        tag = predicate[0]
+        value = predicate[-1]
+        def select(context, result):
+            for elem in result:
+                for e in elem.findall(tag):
+                    if "".join(e.itertext()) == value:
+                        yield elem
+                        break
+        return select
+    if signature == "-" or signature == "-()" or signature == "-()-":
+        # [index] or [last()] or [last()-index]
+        if signature == "-":
+            # [index]
+            index = int(predicate[0]) - 1
+            if index < 0:
+                raise SyntaxError("XPath position >= 1 expected")
+        else:
+            if predicate[0] != "last":
+                raise SyntaxError("unsupported function")
+            if signature == "-()-":
+                try:
+                    index = int(predicate[2]) - 1
+                except ValueError:
+                    raise SyntaxError("unsupported expression")
+                if index > -2:
+                    raise SyntaxError("XPath offset from last() must be negative")
+            else:
+                index = -1
+        def select(context, result):
+            parent_map = get_parent_map(context)
+            for elem in result:
+                try:
+                    parent = parent_map[elem]
+                    # FIXME: what if the selector is "*" ?
+                    elems = list(parent.findall(elem.tag))
+                    if elems[index] is elem:
+                        yield elem
+                except (IndexError, KeyError):
+                    pass
+        return select
+    raise SyntaxError("invalid predicate")
+
+ops = {
+    "": prepare_child,
+    "*": prepare_star,
+    ".": prepare_self,
+    "..": prepare_parent,
+    "//": prepare_descendant,
+    "[": prepare_predicate,
+    }
+
+_cache = {}
+
+class _SelectorContext:
+    parent_map = None
+    def __init__(self, root):
+        self.root = root
+
+# --------------------------------------------------------------------
+
+##
+# Generate all matching objects.
+
+def iterfind(elem, path, namespaces=None):
+    # compile selector pattern
+    cache_key = (path, None if namespaces is None
+                            else tuple(sorted(namespaces.items())))
+    if path[-1:] == "/":
+        path = path + "*" # implicit all (FIXME: keep this?)
+    try:
+        selector = _cache[cache_key]
+    except KeyError:
+        if len(_cache) > 100:
+            _cache.clear()
+        if path[:1] == "/":
+            raise SyntaxError("cannot use absolute path on element")
+        next = iter(xpath_tokenizer(path, namespaces)).__next__
+        try:
+            token = next()
+        except StopIteration:
+            return
+        selector = []
+        while 1:
+            try:
+                selector.append(ops[token[0]](next, token))
+            except StopIteration:
+                raise SyntaxError("invalid path")
+            try:
+                token = next()
+                if token[0] == "/":
+                    token = next()
+            except StopIteration:
+                break
+        _cache[cache_key] = selector
+    # execute selector pattern
+    result = [elem]
+    context = _SelectorContext(elem)
+    for select in selector:
+        result = select(context, result)
+    return result
+
+##
+# Find first matching object.
+
+def find(elem, path, namespaces=None):
+    return next(iterfind(elem, path, namespaces), None)
+
+##
+# Find all matching objects.
+
+def findall(elem, path, namespaces=None):
+    return list(iterfind(elem, path, namespaces))
+
+##
+# Find text for first matching object.
+
+def findtext(elem, path, default=None, namespaces=None):
+    try:
+        elem = next(iterfind(elem, path, namespaces))
+        return elem.text or ""
+    except StopIteration:
+        return default
diff --git a/modules/language/python/module/xml/etree/ElementTree.py b/modules/language/python/module/xml/etree/ElementTree.py
new file mode 100644
index 0000000..fe16745
--- /dev/null
+++ b/modules/language/python/module/xml/etree/ElementTree.py
@@ -0,0 +1,1658 @@
+module(xml,etree,ElementTree)
+
+"""Lightweight XML support for Python.
+
+ XML is an inherently hierarchical data format, and the most natural way to
+ represent it is with a tree.  This module has two classes for this purpose:
+
+    1. ElementTree represents the whole XML document as a tree and
+
+    2. Element represents a single node in this tree.
+
+ Interactions with the whole document (reading and writing to/from files) are
+ usually done on the ElementTree level.  Interactions with a single XML element
+ and its sub-elements are done on the Element level.
+
+ Element is a flexible container object designed to store hierarchical data
+ structures in memory. It can be described as a cross between a list and a
+ dictionary.  Each Element has a number of properties associated with it:
+
+    'tag' - a string containing the element's name.
+
+    'attributes' - a Python dictionary storing the element's attributes.
+
+    'text' - a string containing the element's text content.
+
+    'tail' - an optional string containing text after the element's end tag.
+
+    And a number of child elements stored in a Python sequence.
+
+ To create an element instance, use the Element constructor,
+ or the SubElement factory function.
+
+ You can also use the ElementTree class to wrap an element structure
+ and convert it to and from XML.
+
+"""
+
+#---------------------------------------------------------------------
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
+#
+# ElementTree
+# Copyright (c) 1999-2008 by Fredrik Lundh.  All rights reserved.
+#
+# fredrik@pythonware.com
+# http://www.pythonware.com
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2008 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+__all__ = [
+    # public symbols
+    "Comment",
+    "dump",
+    "Element", "ElementTree",
+    "fromstring", "fromstringlist",
+    "iselement", "iterparse",
+    "parse", "ParseError",
+    "PI", "ProcessingInstruction",
+    "QName",
+    "SubElement",
+    "tostring", "tostringlist",
+    "TreeBuilder",
+    "VERSION",
+    "XML", "XMLID",
+    "XMLParser", "XMLPullParser",
+    "register_namespace",
+    ]
+
+VERSION = "1.3.0"
+
+import sys
+import re
+import warnings
+import io
+import collections
+import contextlib
+
+import xml.etree.ElementPath as ElementPath
+
+
+class ParseError(SyntaxError):
+    """An error when parsing an XML document.
+
+    In addition to its exception value, a ParseError contains
+    two extra attributes:
+        'code'     - the specific exception code
+        'position' - the line and column of the error
+
+    """
+    pass
+
+# --------------------------------------------------------------------
+
+
+def iselement(element):
+    """Return True if *element* appears to be an Element."""
+    return hasattr(element, 'tag')
+
+
+class Element:
+    """An XML element.
+
+    This class is the reference implementation of the Element interface.
+
+    An element's length is its number of subelements.  That means if you
+    want to check if an element is truly empty, you should check BOTH
+    its length AND its text attribute.
+
+    The element tag, attribute names, and attribute values can be either
+    bytes or strings.
+
+    *tag* is the element name.  *attrib* is an optional dictionary containing
+    element attributes. *extra* are additional element attributes given as
+    keyword arguments.
+
+    Example form:
+        <tag attrib>text<child/>...</tag>tail
+
+    """
+
+    tag = None
+    """The element's name."""
+
+    attrib = None
+    """Dictionary of the element's attributes."""
+
+    text = None
+    """
+    Text before first subelement. This is either a string or the value None.
+    Note that if there is no text, this attribute may be either
+    None or the empty string, depending on the parser.
+
+    """
+
+    tail = None
+    """
+    Text after this element's end tag, but before the next sibling element's
+    start tag.  This is either a string or the value None.  Note that if there
+    was no text, this attribute may be either None or an empty string,
+    depending on the parser.
+
+    """
+
+    def __init__(self, tag, attrib={}, **extra):
+        if not isinstance(attrib, dict):
+            raise TypeError("attrib must be dict, not %s" % (
+                attrib.__class__.__name__,))
+        attrib = attrib.copy()
+        attrib.update(extra)
+        self.tag = tag
+        self.attrib = attrib
+        self._children = []
+
+    def __repr__(self):
+        return "<%s %r at %#x>" % (self.__class__.__name__, self.tag, id(self))
+
+    def makeelement(self, tag, attrib):
+        """Create a new element with the same type.
+
+        *tag* is a string containing the element name.
+        *attrib* is a dictionary containing the element attributes.
+
+        Do not call this method, use the SubElement factory function instead.
+
+        """
+        return self.__class__(tag, attrib)
+
+    def copy(self):
+        """Return copy of current element.
+
+        This creates a shallow copy. Subelements will be shared with the
+        original tree.
+
+        """
+        elem = self.makeelement(self.tag, self.attrib)
+        elem.text = self.text
+        elem.tail = self.tail
+        elem[:] = self
+        return elem
+
+    def __len__(self):
+        return len(self._children)
+
+    def __bool__(self):
+        warnings.warn(
+            "The behavior of this method will change in future versions.  "
+            "Use specific 'len(elem)' or 'elem is not None' test instead.",
+            FutureWarning, stacklevel=2
+            )
+        return len(self._children) != 0 # emulate old behaviour, for now
+
+    def __getitem__(self, index):
+        return self._children[index]
+
+    def __setitem__(self, index, element):
+        # if isinstance(index, slice):
+        #     for elt in element:
+        #         assert iselement(elt)
+        # else:
+        #     assert iselement(element)
+        self._children[index] = element
+
+    def __delitem__(self, index):
+        del self._children[index]
+
+    def append(self, subelement):
+        """Add *subelement* to the end of this element.
+
+        The new element will appear in document order after the last existing
+        subelement (or directly after the text, if it's the first subelement),
+        but before the end tag for this element.
+
+        """
+        self._assert_is_element(subelement)
+        self._children.append(subelement)
+
+    def extend(self, elements):
+        """Append subelements from a sequence.
+
+        *elements* is a sequence with zero or more elements.
+
+        """
+        for element in elements:
+            self._assert_is_element(element)
+        self._children.extend(elements)
+
+    def insert(self, index, subelement):
+        """Insert *subelement* at position *index*."""
+        self._assert_is_element(subelement)
+        self._children.insert(index, subelement)
+
+    def _assert_is_element(self, e):
+        # Need to refer to the actual Python implementation, not the
+        # shadowing C implementation.
+        if not isinstance(e, _Element_Py):
+            raise TypeError('expected an Element, not %s' % type(e).__name__)
+
+    def remove(self, subelement):
+        """Remove matching subelement.
+
+        Unlike the find methods, this method compares elements based on
+        identity, NOT ON tag value or contents.  To remove subelements by
+        other means, the easiest way is to use a list comprehension to
+        select what elements to keep, and then use slice assignment to update
+        the parent element.
+
+        ValueError is raised if a matching element could not be found.
+
+        """
+        # assert iselement(element)
+        self._children.remove(subelement)
+
+    def getchildren(self):
+        """(Deprecated) Return all subelements.
+
+        Elements are returned in document order.
+
+        """
+        warnings.warn(
+            "This method will be removed in future versions.  "
+            "Use 'list(elem)' or iteration over elem instead.",
+            DeprecationWarning, stacklevel=2
+            )
+        return self._children
+
+    def find(self, path, namespaces=None):
+        """Find first matching element by tag name or path.
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return the first matching element, or None if no element was found.
+
+        """
+        return ElementPath.find(self, path, namespaces)
+
+    def findtext(self, path, default=None, namespaces=None):
+        """Find text for first matching element by tag name or path.
+
+        *path* is a string having either an element tag or an XPath,
+        *default* is the value to return if the element was not found,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return text content of first matching element, or default value if
+        none was found.  Note that if an element is found having no text
+        content, the empty string is returned.
+
+        """
+        return ElementPath.findtext(self, path, default, namespaces)
+
+    def findall(self, path, namespaces=None):
+        """Find all matching subelements by tag name or path.
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Returns list containing all matching elements in document order.
+
+        """
+        return ElementPath.findall(self, path, namespaces)
+
+    def iterfind(self, path, namespaces=None):
+        """Find all matching subelements by tag name or path.
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return an iterable yielding all matching elements in document order.
+
+        """
+        return ElementPath.iterfind(self, path, namespaces)
+
+    def clear(self):
+        """Reset element.
+
+        This function removes all subelements, clears all attributes, and sets
+        the text and tail attributes to None.
+
+        """
+        self.attrib.clear()
+        self._children = []
+        self.text = self.tail = None
+
+    def get(self, key, default=None):
+        """Get element attribute.
+
+        Equivalent to attrib.get, but some implementations may handle this a
+        bit more efficiently.  *key* is what attribute to look for, and
+        *default* is what to return if the attribute was not found.
+
+        Returns a string containing the attribute value, or the default if
+        attribute was not found.
+
+        """
+        return self.attrib.get(key, default)
+
+    def set(self, key, value):
+        """Set element attribute.
+
+        Equivalent to attrib[key] = value, but some implementations may handle
+        this a bit more efficiently.  *key* is what attribute to set, and
+        *value* is the attribute value to set it to.
+
+        """
+        self.attrib[key] = value
+
+    def keys(self):
+        """Get list of attribute names.
+
+        Names are returned in an arbitrary order, just like an ordinary
+        Python dict.  Equivalent to attrib.keys()
+
+        """
+        return self.attrib.keys()
+
+    def items(self):
+        """Get element attributes as a sequence.
+
+        The attributes are returned in arbitrary order.  Equivalent to
+        attrib.items().
+
+        Return a list of (name, value) tuples.
+
+        """
+        return self.attrib.items()
+
+    def iter(self, tag=None):
+        """Create tree iterator.
+
+        The iterator loops over the element and all subelements in document
+        order, returning all elements with a matching tag.
+
+        If the tree structure is modified during iteration, new or removed
+        elements may or may not be included.  To get a stable set, use the
+        list() function on the iterator, and loop over the resulting list.
+
+        *tag* is what tags to look for (default is to return all elements)
+
+        Return an iterator containing all the matching elements.
+
+        """
+        if tag == "*":
+            tag = None
+        if tag is None or self.tag == tag:
+            yield self
+        for e in self._children:
+            yield from e.iter(tag)
+
+    # compatibility
+    def getiterator(self, tag=None):
+        # Change for a DeprecationWarning in 1.4
+        warnings.warn(
+            "This method will be removed in future versions.  "
+            "Use 'elem.iter()' or 'list(elem.iter())' instead.",
+            PendingDeprecationWarning, stacklevel=2
+        )
+        return list(self.iter(tag))
+
+    def itertext(self):
+        """Create text iterator.
+
+        The iterator loops over the element and all subelements in document
+        order, returning all inner text.
+
+        """
+        tag = self.tag
+        if not isinstance(tag, str) and tag is not None:
+            return
+        t = self.text
+        if t:
+            yield t
+        for e in self:
+            yield from e.itertext()
+            t = e.tail
+            if t:
+                yield t
+
+
+def SubElement(parent, tag, attrib={}, **extra):
+    """Subelement factory which creates an element instance, and appends it
+    to an existing parent.
+
+    The element tag, attribute names, and attribute values can be either
+    bytes or Unicode strings.
+
+    *parent* is the parent element, *tag* is the subelements name, *attrib* is
+    an optional directory containing element attributes, *extra* are
+    additional attributes given as keyword arguments.
+
+    """
+    attrib = attrib.copy()
+    attrib.update(extra)
+    element = parent.makeelement(tag, attrib)
+    parent.append(element)
+    return element
+
+
+def Comment(text=None):
+    """Comment element factory.
+
+    This function creates a special element which the standard serializer
+    serializes as an XML comment.
+
+    *text* is a string containing the comment string.
+
+    """
+    element = Element(Comment)
+    element.text = text
+    return element
+
+
+def ProcessingInstruction(target, text=None):
+    """Processing Instruction element factory.
+
+    This function creates a special element which the standard serializer
+    serializes as an XML comment.
+
+    *target* is a string containing the processing instruction, *text* is a
+    string containing the processing instruction contents, if any.
+
+    """
+    element = Element(ProcessingInstruction)
+    element.text = target
+    if text:
+        element.text = element.text + " " + text
+    return element
+
+PI = ProcessingInstruction
+
+
+class QName:
+    """Qualified name wrapper.
+
+    This class can be used to wrap a QName attribute value in order to get
+    proper namespace handing on output.
+
+    *text_or_uri* is a string containing the QName value either in the form
+    {uri}local, or if the tag argument is given, the URI part of a QName.
+
+    *tag* is an optional argument which if given, will make the first
+    argument (text_or_uri) be interpreted as a URI, and this argument (tag)
+    be interpreted as a local name.
+
+    """
+    def __init__(self, text_or_uri, tag=None):
+        if tag:
+            text_or_uri = "{%s}%s" % (text_or_uri, tag)
+        self.text = text_or_uri
+    def __str__(self):
+        return self.text
+    def __repr__(self):
+        return '<%s %r>' % (self.__class__.__name__, self.text)
+    def __hash__(self):
+        return hash(self.text)
+    def __le__(self, other):
+        if isinstance(other, QName):
+            return self.text <= other.text
+        return self.text <= other
+    def __lt__(self, other):
+        if isinstance(other, QName):
+            return self.text < other.text
+        return self.text < other
+    def __ge__(self, other):
+        if isinstance(other, QName):
+            return self.text >= other.text
+        return self.text >= other
+    def __gt__(self, other):
+        if isinstance(other, QName):
+            return self.text > other.text
+        return self.text > other
+    def __eq__(self, other):
+        if isinstance(other, QName):
+            return self.text == other.text
+        return self.text == other
+
+# --------------------------------------------------------------------
+
+
+class ElementTree:
+    """An XML element hierarchy.
+
+    This class also provides support for serialization to and from
+    standard XML.
+
+    *element* is an optional root element node,
+    *file* is an optional file handle or file name of an XML file whose
+    contents will be used to initialize the tree with.
+
+    """
+    def __init__(self, element=None, file=None):
+        # assert element is None or iselement(element)
+        self._root = element # first node
+        if file:
+            self.parse(file)
+
+    def getroot(self):
+        """Return root element of this tree."""
+        return self._root
+
+    def _setroot(self, element):
+        """Replace root element of this tree.
+
+        This will discard the current contents of the tree and replace it
+        with the given element.  Use with care!
+
+        """
+        # assert iselement(element)
+        self._root = element
+
+    def parse(self, source, parser=None):
+        """Load external XML document into element tree.
+
+        *source* is a file name or file object, *parser* is an optional parser
+        instance that defaults to XMLParser.
+
+        ParseError is raised if the parser fails to parse the document.
+
+        Returns the root element of the given source document.
+
+        """
+        close_source = False
+        if not hasattr(source, "read"):
+            source = open(source, "rb")
+            close_source = True
+        try:
+            if parser is None:
+                # If no parser was specified, create a default XMLParser
+                parser = XMLParser()
+                if hasattr(parser, '_parse_whole'):
+                    # The default XMLParser, when it comes from an accelerator,
+                    # can define an internal _parse_whole API for efficiency.
+                    # It can be used to parse the whole source without feeding
+                    # it with chunks.
+                    self._root = parser._parse_whole(source)
+                    return self._root
+            while True:
+                data = source.read(65536)
+                if not data:
+                    break
+                parser.feed(data)
+            self._root = parser.close()
+            return self._root
+        finally:
+            if close_source:
+                source.close()
+
+    def iter(self, tag=None):
+        """Create and return tree iterator for the root element.
+
+        The iterator loops over all elements in this tree, in document order.
+
+        *tag* is a string with the tag name to iterate over
+        (default is to return all elements).
+
+        """
+        # assert self._root is not None
+        return self._root.iter(tag)
+
+    # compatibility
+    def getiterator(self, tag=None):
+        # Change for a DeprecationWarning in 1.4
+        warnings.warn(
+            "This method will be removed in future versions.  "
+            "Use 'tree.iter()' or 'list(tree.iter())' instead.",
+            PendingDeprecationWarning, stacklevel=2
+        )
+        return list(self.iter(tag))
+
+    def find(self, path, namespaces=None):
+        """Find first matching element by tag name or path.
+
+        Same as getroot().find(path), which is Element.find()
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return the first matching element, or None if no element was found.
+
+        """
+        # assert self._root is not None
+        if path[:1] == "/":
+            path = "." + path
+            warnings.warn(
+                "This search is broken in 1.3 and earlier, and will be "
+                "fixed in a future version.  If you rely on the current "
+                "behaviour, change it to %r" % path,
+                FutureWarning, stacklevel=2
+                )
+        return self._root.find(path, namespaces)
+
+    def findtext(self, path, default=None, namespaces=None):
+        """Find first matching element by tag name or path.
+
+        Same as getroot().findtext(path),  which is Element.findtext()
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return the first matching element, or None if no element was found.
+
+        """
+        # assert self._root is not None
+        if path[:1] == "/":
+            path = "." + path
+            warnings.warn(
+                "This search is broken in 1.3 and earlier, and will be "
+                "fixed in a future version.  If you rely on the current "
+                "behaviour, change it to %r" % path,
+                FutureWarning, stacklevel=2
+                )
+        return self._root.findtext(path, default, namespaces)
+
+    def findall(self, path, namespaces=None):
+        """Find all matching subelements by tag name or path.
+
+        Same as getroot().findall(path), which is Element.findall().
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return list containing all matching elements in document order.
+
+        """
+        # assert self._root is not None
+        if path[:1] == "/":
+            path = "." + path
+            warnings.warn(
+                "This search is broken in 1.3 and earlier, and will be "
+                "fixed in a future version.  If you rely on the current "
+                "behaviour, change it to %r" % path,
+                FutureWarning, stacklevel=2
+                )
+        return self._root.findall(path, namespaces)
+
+    def iterfind(self, path, namespaces=None):
+        """Find all matching subelements by tag name or path.
+
+        Same as getroot().iterfind(path), which is element.iterfind()
+
+        *path* is a string having either an element tag or an XPath,
+        *namespaces* is an optional mapping from namespace prefix to full name.
+
+        Return an iterable yielding all matching elements in document order.
+
+        """
+        # assert self._root is not None
+        if path[:1] == "/":
+            path = "." + path
+            warnings.warn(
+                "This search is broken in 1.3 and earlier, and will be "
+                "fixed in a future version.  If you rely on the current "
+                "behaviour, change it to %r" % path,
+                FutureWarning, stacklevel=2
+                )
+        return self._root.iterfind(path, namespaces)
+
+    def write(self, file_or_filename,
+              encoding=None,
+              xml_declaration=None,
+              default_namespace=None,
+              method=None, *,
+              short_empty_elements=True):
+        """Write element tree to a file as XML.
+
+        Arguments:
+          *file_or_filename* -- file name or a file object opened for writing
+
+          *encoding* -- the output encoding (default: US-ASCII)
+
+          *xml_declaration* -- bool indicating if an XML declaration should be
+                               added to the output. If None, an XML declaration
+                               is added if encoding IS NOT either of:
+                               US-ASCII, UTF-8, or Unicode
+
+          *default_namespace* -- sets the default XML namespace (for "xmlns")
+
+          *method* -- either "xml" (default), "html, "text", or "c14n"
+
+          *short_empty_elements* -- controls the formatting of elements
+                                    that contain no content. If True (default)
+                                    they are emitted as a single self-closed
+                                    tag, otherwise they are emitted as a pair
+                                    of start/end tags
+
+        """
+        if not method:
+            method = "xml"
+        elif method not in _serialize:
+            raise ValueError("unknown method %r" % method)
+        if not encoding:
+            if method == "c14n":
+                encoding = "utf-8"
+            else:
+                encoding = "us-ascii"
+        enc_lower = encoding.lower()
+        with _get_writer(file_or_filename, enc_lower) as write:
+            if method == "xml" and (xml_declaration or
+                    (xml_declaration is None and
+                     enc_lower not in ("utf-8", "us-ascii", "unicode"))):
+                declared_encoding = encoding
+                if enc_lower == "unicode":
+                    # Retrieve the default encoding for the xml declaration
+                    import locale
+                    declared_encoding = locale.getpreferredencoding()
+                write("<?xml version='1.0' encoding='%s'?>\n" % (
+                    declared_encoding,))
+            if method == "text":
+                _serialize_text(write, self._root)
+            else:
+                qnames, namespaces = _namespaces(self._root, default_namespace)
+                serialize = _serialize[method]
+                serialize(write, self._root, qnames, namespaces,
+                          short_empty_elements=short_empty_elements)
+
+    def write_c14n(self, file):
+        # lxml.etree compatibility.  use output method instead
+        return self.write(file, method="c14n")
+
+# --------------------------------------------------------------------
+# serialization support
+
+@contextlib.contextmanager
+def _get_writer(file_or_filename, encoding):
+    # returns text write method and release all resources after using
+    try:
+        write = file_or_filename.write
+    except AttributeError:
+        # file_or_filename is a file name
+        if encoding == "unicode":
+            file = open(file_or_filename, "w")
+        else:
+            file = open(file_or_filename, "w", encoding=encoding,
+                        errors="xmlcharrefreplace")
+        with file:
+            yield file.write
+    else:
+        # file_or_filename is a file-like object
+        # encoding determines if it is a text or binary writer
+        if encoding == "unicode":
+            # use a text writer as is
+            yield write
+        else:
+            # wrap a binary writer with TextIOWrapper
+            with contextlib.ExitStack() as stack:
+                if isinstance(file_or_filename, io.BufferedIOBase):
+                    file = file_or_filename
+                elif isinstance(file_or_filename, io.RawIOBase):
+                    file = io.BufferedWriter(file_or_filename)
+                    # Keep the original file open when the BufferedWriter is
+                    # destroyed
+                    stack.callback(file.detach)
+                else:
+                    # This is to handle passed objects that aren't in the
+                    # IOBase hierarchy, but just have a write method
+                    file = io.BufferedIOBase()
+                    file.writable = lambda: True
+                    file.write = write
+                    try:
+                        # TextIOWrapper uses this methods to determine
+                        # if BOM (for UTF-16, etc) should be added
+                        file.seekable = file_or_filename.seekable
+                        file.tell = file_or_filename.tell
+                    except AttributeError:
+                        pass
+                file = io.TextIOWrapper(file,
+                                        encoding=encoding,
+                                        errors="xmlcharrefreplace",
+                                        newline="\n")
+                # Keep the original file open when the TextIOWrapper is
+                # destroyed
+                stack.callback(file.detach)
+                yield file.write
+
+def _namespaces(elem, default_namespace=None):
+    # identify namespaces used in this tree
+
+    # maps qnames to *encoded* prefix:local names
+    qnames = {None: None}
+
+    # maps uri:s to prefixes
+    namespaces = {}
+    if default_namespace:
+        namespaces[default_namespace] = ""
+
+    def add_qname(qname):
+        # calculate serialized qname representation
+        try:
+            if qname[:1] == "{":
+                uri, tag = qname[1:].rsplit("}", 1)
+                prefix = namespaces.get(uri)
+                if prefix is None:
+                    prefix = _namespace_map.get(uri)
+                    if prefix is None:
+                        prefix = "ns%d" % len(namespaces)
+                    if prefix != "xml":
+                        namespaces[uri] = prefix
+                if prefix:
+                    qnames[qname] = "%s:%s" % (prefix, tag)
+                else:
+                    qnames[qname] = tag # default element
+            else:
+                if default_namespace:
+                    # FIXME: can this be handled in XML 1.0?
+                    raise ValueError(
+                        "cannot use non-qualified names with "
+                        "default_namespace option"
+                        )
+                qnames[qname] = qname
+        except TypeError:
+            _raise_serialization_error(qname)
+
+    # populate qname and namespaces table
+    for elem in elem.iter():
+        tag = elem.tag
+        if isinstance(tag, QName):
+            if tag.text not in qnames:
+                add_qname(tag.text)
+        elif isinstance(tag, str):
+            if tag not in qnames:
+                add_qname(tag)
+        elif tag is not None and tag is not Comment and tag is not PI:
+            _raise_serialization_error(tag)
+        for key, value in elem.items():
+            if isinstance(key, QName):
+                key = key.text
+            if key not in qnames:
+                add_qname(key)
+            if isinstance(value, QName) and value.text not in qnames:
+                add_qname(value.text)
+        text = elem.text
+        if isinstance(text, QName) and text.text not in qnames:
+            add_qname(text.text)
+    return qnames, namespaces
+
+def _serialize_xml(write, elem, qnames, namespaces,
+                   short_empty_elements, **kwargs):
+    tag = elem.tag
+    text = elem.text
+    if tag is Comment:
+        write("<!--%s-->" % text)
+    elif tag is ProcessingInstruction:
+        write("<?%s?>" % text)
+    else:
+        tag = qnames[tag]
+        if tag is None:
+            if text:
+                write(_escape_cdata(text))
+            for e in elem:
+                _serialize_xml(write, e, qnames, None,
+                               short_empty_elements=short_empty_elements)
+        else:
+            write("<" + tag)
+            items = list(elem.items())
+            if items or namespaces:
+                if namespaces:
+                    for v, k in sorted(namespaces.items(),
+                                       key=lambda x: x[1]):  # sort on prefix
+                        if k:
+                            k = ":" + k
+                        write(" xmlns%s=\"%s\"" % (
+                            k,
+                            _escape_attrib(v)
+                            ))
+                for k, v in sorted(items):  # lexical order
+                    if isinstance(k, QName):
+                        k = k.text
+                    if isinstance(v, QName):
+                        v = qnames[v.text]
+                    else:
+                        v = _escape_attrib(v)
+                    write(" %s=\"%s\"" % (qnames[k], v))
+            if text or len(elem) or not short_empty_elements:
+                write(">")
+                if text:
+                    write(_escape_cdata(text))
+                for e in elem:
+                    _serialize_xml(write, e, qnames, None,
+                                   short_empty_elements=short_empty_elements)
+                write("</" + tag + ">")
+            else:
+                write(" />")
+    if elem.tail:
+        write(_escape_cdata(elem.tail))
+
+HTML_EMPTY = ("area", "base", "basefont", "br", "col", "frame", "hr",
+              "img", "input", "isindex", "link", "meta", "param")
+
+try:
+    HTML_EMPTY = set(HTML_EMPTY)
+except NameError:
+    pass
+
+def _serialize_html(write, elem, qnames, namespaces, **kwargs):
+    tag = elem.tag
+    text = elem.text
+    if tag is Comment:
+        write("<!--%s-->" % _escape_cdata(text))
+    elif tag is ProcessingInstruction:
+        write("<?%s?>" % _escape_cdata(text))
+    else:
+        tag = qnames[tag]
+        if tag is None:
+            if text:
+                write(_escape_cdata(text))
+            for e in elem:
+                _serialize_html(write, e, qnames, None)
+        else:
+            write("<" + tag)
+            items = list(elem.items())
+            if items or namespaces:
+                if namespaces:
+                    for v, k in sorted(namespaces.items(),
+                                       key=lambda x: x[1]):  # sort on prefix
+                        if k:
+                            k = ":" + k
+                        write(" xmlns%s=\"%s\"" % (
+                            k,
+                            _escape_attrib(v)
+                            ))
+                for k, v in sorted(items):  # lexical order
+                    if isinstance(k, QName):
+                        k = k.text
+                    if isinstance(v, QName):
+                        v = qnames[v.text]
+                    else:
+                        v = _escape_attrib_html(v)
+                    # FIXME: handle boolean attributes
+                    write(" %s=\"%s\"" % (qnames[k], v))
+            write(">")
+            ltag = tag.lower()
+            if text:
+                if ltag == "script" or ltag == "style":
+                    write(text)
+                else:
+                    write(_escape_cdata(text))
+            for e in elem:
+                _serialize_html(write, e, qnames, None)
+            if ltag not in HTML_EMPTY:
+                write("</" + tag + ">")
+    if elem.tail:
+        write(_escape_cdata(elem.tail))
+
+def _serialize_text(write, elem):
+    for part in elem.itertext():
+        write(part)
+    if elem.tail:
+        write(elem.tail)
+
+_serialize = {
+    "xml": _serialize_xml,
+    "html": _serialize_html,
+    "text": _serialize_text,
+# this optional method is imported at the end of the module
+#   "c14n": _serialize_c14n,
+}
+
+
+def register_namespace(prefix, uri):
+    """Register a namespace prefix.
+
+    The registry is global, and any existing mapping for either the
+    given prefix or the namespace URI will be removed.
+
+    *prefix* is the namespace prefix, *uri* is a namespace uri. Tags and
+    attributes in this namespace will be serialized with prefix if possible.
+
+    ValueError is raised if prefix is reserved or is invalid.
+
+    """
+    if re.match(r"ns\d+$", prefix):
+        raise ValueError("Prefix format reserved for internal use")
+    for k, v in list(_namespace_map.items()):
+        if k == uri or v == prefix:
+            del _namespace_map[k]
+    _namespace_map[uri] = prefix
+
+_namespace_map = {
+    # "well-known" namespace prefixes
+    "http://www.w3.org/XML/1998/namespace": "xml",
+    "http://www.w3.org/1999/xhtml": "html",
+    "http://www.w3.org/1999/02/22-rdf-syntax-ns#": "rdf",
+    "http://schemas.xmlsoap.org/wsdl/": "wsdl",
+    # xml schema
+    "http://www.w3.org/2001/XMLSchema": "xs",
+    "http://www.w3.org/2001/XMLSchema-instance": "xsi",
+    # dublin core
+    "http://purl.org/dc/elements/1.1/": "dc",
+}
+# For tests and troubleshooting
+register_namespace._namespace_map = _namespace_map
+
+def _raise_serialization_error(text):
+    raise TypeError(
+        "cannot serialize %r (type %s)" % (text, type(text).__name__)
+        )
+
+def _escape_cdata(text):
+    # escape character data
+    try:
+        # it's worth avoiding do-nothing calls for strings that are
+        # shorter than 500 characters, or so.  assume that's, by far,
+        # the most common case in most applications.
+        if "&" in text:
+            text = text.replace("&", "&amp;")
+        if "<" in text:
+            text = text.replace("<", "&lt;")
+        if ">" in text:
+            text = text.replace(">", "&gt;")
+        return text
+    except (TypeError, AttributeError):
+        _raise_serialization_error(text)
+
+def _escape_attrib(text):
+    # escape attribute value
+    try:
+        if "&" in text:
+            text = text.replace("&", "&amp;")
+        if "<" in text:
+            text = text.replace("<", "&lt;")
+        if ">" in text:
+            text = text.replace(">", "&gt;")
+        if "\"" in text:
+            text = text.replace("\"", "&quot;")
+        # The following business with carriage returns is to satisfy
+        # Section 2.11 of the XML specification, stating that
+        # CR or CR LN should be replaced with just LN
+        # http://www.w3.org/TR/REC-xml/#sec-line-ends
+        if "\r\n" in text:
+            text = text.replace("\r\n", "\n")
+        if "\r" in text:
+            text = text.replace("\r", "\n")
+        #The following four lines are issue 17582
+        if "\n" in text:
+            text = text.replace("\n", "&#10;")
+        if "\t" in text:
+            text = text.replace("\t", "&#09;")
+        return text
+    except (TypeError, AttributeError):
+        _raise_serialization_error(text)
+
+def _escape_attrib_html(text):
+    # escape attribute value
+    try:
+        if "&" in text:
+            text = text.replace("&", "&amp;")
+        if ">" in text:
+            text = text.replace(">", "&gt;")
+        if "\"" in text:
+            text = text.replace("\"", "&quot;")
+        return text
+    except (TypeError, AttributeError):
+        _raise_serialization_error(text)
+
+# --------------------------------------------------------------------
+
+def tostring(element, encoding=None, method=None, *,
+             short_empty_elements=True):
+    """Generate string representation of XML element.
+
+    All subelements are included.  If encoding is "unicode", a string
+    is returned. Otherwise a bytestring is returned.
+
+    *element* is an Element instance, *encoding* is an optional output
+    encoding defaulting to US-ASCII, *method* is an optional output which can
+    be one of "xml" (default), "html", "text" or "c14n".
+
+    Returns an (optionally) encoded string containing the XML data.
+
+    """
+    stream = io.StringIO() if encoding == 'unicode' else io.BytesIO()
+    ElementTree(element).write(stream, encoding, method=method,
+                               short_empty_elements=short_empty_elements)
+    return stream.getvalue()
+
+class _ListDataStream(io.BufferedIOBase):
+    """An auxiliary stream accumulating into a list reference."""
+    def __init__(self, lst):
+        self.lst = lst
+
+    def writable(self):
+        return True
+
+    def seekable(self):
+        return True
+
+    def write(self, b):
+        self.lst.append(b)
+
+    def tell(self):
+        return len(self.lst)
+
+def tostringlist(element, encoding=None, method=None, *,
+                 short_empty_elements=True):
+    lst = []
+    stream = _ListDataStream(lst)
+    ElementTree(element).write(stream, encoding, method=method,
+                               short_empty_elements=short_empty_elements)
+    return lst
+
+
+def dump(elem):
+    """Write element tree or element structure to sys.stdout.
+
+    This function should be used for debugging only.
+
+    *elem* is either an ElementTree, or a single Element.  The exact output
+    format is implementation dependent.  In this version, it's written as an
+    ordinary XML file.
+
+    """
+    # debugging
+    if not isinstance(elem, ElementTree):
+        elem = ElementTree(elem)
+    elem.write(sys.stdout, encoding="unicode")
+    tail = elem.getroot().tail
+    if not tail or tail[-1] != "\n":
+        sys.stdout.write("\n")
+
+# --------------------------------------------------------------------
+# parsing
+
+
+def parse(source, parser=None):
+    """Parse XML document into element tree.
+
+    *source* is a filename or file object containing XML data,
+    *parser* is an optional parser instance defaulting to XMLParser.
+
+    Return an ElementTree instance.
+
+    """
+    tree = ElementTree()
+    tree.parse(source, parser)
+    return tree
+
+
+def iterparse(source, events=None, parser=None):
+    """Incrementally parse XML document into ElementTree.
+
+    This class also reports what's going on to the user based on the
+    *events* it is initialized with.  The supported events are the strings
+    "start", "end", "start-ns" and "end-ns" (the "ns" events are used to get
+    detailed namespace information).  If *events* is omitted, only
+    "end" events are reported.
+
+    *source* is a filename or file object containing XML data, *events* is
+    a list of events to report back, *parser* is an optional parser instance.
+
+    Returns an iterator providing (event, elem) pairs.
+
+    """
+    # Use the internal, undocumented _parser argument for now; When the
+    # parser argument of iterparse is removed, this can be killed.
+    pullparser = XMLPullParser(events=events, _parser=parser)
+    def iterator():
+        try:
+            while True:
+                yield from pullparser.read_events()
+                # load event buffer
+                data = source.read(16 * 1024)
+                if not data:
+                    break
+                pullparser.feed(data)
+            root = pullparser._close_and_return_root()
+            yield from pullparser.read_events()
+            it.root = root
+        finally:
+            if close_source:
+                source.close()
+
+    class IterParseIterator(collections.Iterator):
+        __next__ = iterator().__next__
+    it = IterParseIterator()
+    it.root = None
+    del iterator, IterParseIterator
+
+    close_source = False
+    if not hasattr(source, "read"):
+        source = open(source, "rb")
+        close_source = True
+
+    return it
+
+
+class XMLPullParser:
+
+    def __init__(self, events=None, *, _parser=None):
+        # The _parser argument is for internal use only and must not be relied
+        # upon in user code. It will be removed in a future release.
+        # See http://bugs.python.org/issue17741 for more details.
+
+        self._events_queue = collections.deque()
+        self._parser = _parser or XMLParser(target=TreeBuilder())
+        # wire up the parser for event reporting
+        if events is None:
+            events = ("end",)
+        self._parser._setevents(self._events_queue, events)
+
+    def feed(self, data):
+        """Feed encoded data to parser."""
+        if self._parser is None:
+            raise ValueError("feed() called after end of stream")
+        if data:
+            try:
+                self._parser.feed(data)
+            except SyntaxError as exc:
+                self._events_queue.append(exc)
+
+    def _close_and_return_root(self):
+        # iterparse needs this to set its root attribute properly :(
+        root = self._parser.close()
+        self._parser = None
+        return root
+
+    def close(self):
+        """Finish feeding data to parser.
+
+        Unlike XMLParser, does not return the root element. Use
+        read_events() to consume elements from XMLPullParser.
+        """
+        self._close_and_return_root()
+
+    def read_events(self):
+        """Return an iterator over currently available (event, elem) pairs.
+
+        Events are consumed from the internal event queue as they are
+        retrieved from the iterator.
+        """
+        events = self._events_queue
+        while events:
+            event = events.popleft()
+            if isinstance(event, Exception):
+                raise event
+            else:
+                yield event
+
+
+def XML(text, parser=None):
+    """Parse XML document from string constant.
+
+    This function can be used to embed "XML Literals" in Python code.
+
+    *text* is a string containing XML data, *parser* is an
+    optional parser instance, defaulting to the standard XMLParser.
+
+    Returns an Element instance.
+
+    """
+    if not parser:
+        parser = XMLParser(target=TreeBuilder())
+    parser.feed(text)
+    return parser.close()
+
+
+def XMLID(text, parser=None):
+    """Parse XML document from string constant for its IDs.
+
+    *text* is a string containing XML data, *parser* is an
+    optional parser instance, defaulting to the standard XMLParser.
+
+    Returns an (Element, dict) tuple, in which the
+    dict maps element id:s to elements.
+
+    """
+    if not parser:
+        parser = XMLParser(target=TreeBuilder())
+    parser.feed(text)
+    tree = parser.close()
+    ids = {}
+    for elem in tree.iter():
+        id = elem.get("id")
+        if id:
+            ids[id] = elem
+    return tree, ids
+
+# Parse XML document from string constant.  Alias for XML().
+fromstring = XML
+
+def fromstringlist(sequence, parser=None):
+    """Parse XML document from sequence of string fragments.
+
+    *sequence* is a list of other sequence, *parser* is an optional parser
+    instance, defaulting to the standard XMLParser.
+
+    Returns an Element instance.
+
+    """
+    if not parser:
+        parser = XMLParser(target=TreeBuilder())
+    for text in sequence:
+        parser.feed(text)
+    return parser.close()
+
+# --------------------------------------------------------------------
+
+
+class TreeBuilder:
+    """Generic element structure builder.
+
+    This builder converts a sequence of start, data, and end method
+    calls to a well-formed element structure.
+
+    You can use this class to build an element structure using a custom XML
+    parser, or a parser for some other XML-like format.
+
+    *element_factory* is an optional element factory which is called
+    to create new Element instances, as necessary.
+
+    """
+    def __init__(self, element_factory=None):
+        self._data = [] # data collector
+        self._elem = [] # element stack
+        self._last = None # last element
+        self._tail = None # true if we're after an end tag
+        if element_factory is None:
+            element_factory = Element
+        self._factory = element_factory
+
+    def close(self):
+        """Flush builder buffers and return toplevel document Element."""
+        assert len(self._elem) == 0, "missing end tags"
+        assert self._last is not None, "missing toplevel element"
+        return self._last
+
+    def _flush(self):
+        if self._data:
+            if self._last is not None:
+                text = "".join(self._data)
+                if self._tail:
+                    assert self._last.tail is None, "internal error (tail)"
+                    self._last.tail = text
+                else:
+                    assert self._last.text is None, "internal error (text)"
+                    self._last.text = text
+            self._data = []
+
+    def data(self, data):
+        """Add text to current element."""
+        self._data.append(data)
+
+    def start(self, tag, attrs):
+        """Open new element and return it.
+
+        *tag* is the element name, *attrs* is a dict containing element
+        attributes.
+
+        """
+        self._flush()
+        self._last = elem = self._factory(tag, attrs)
+        if self._elem:
+            self._elem[-1].append(elem)
+        self._elem.append(elem)
+        self._tail = 0
+        return elem
+
+    def end(self, tag):
+        """Close and return current Element.
+
+        *tag* is the element name.
+
+        """
+        self._flush()
+        self._last = self._elem.pop()
+        assert self._last.tag == tag,\
+               "end tag mismatch (expected %s, got %s)" % (
+                   self._last.tag, tag)
+        self._tail = 1
+        return self._last
+
+
+# also see ElementTree and TreeBuilder
+class XMLParser:
+    """Element structure builder for XML source data based on the expat parser.
+
+    *html* are predefined HTML entities (deprecated and not supported),
+    *target* is an optional target object which defaults to an instance of the
+    standard TreeBuilder class, *encoding* is an optional encoding string
+    which if given, overrides the encoding specified in the XML file:
+    http://www.iana.org/assignments/character-sets
+
+    """
+
+    def __init__(self, html=0, target=None, encoding=None):
+        try:
+            from xml.parsers import expat
+        except ImportError:
+            try:
+                import pyexpat as expat
+            except ImportError:
+                raise ImportError(
+                    "No module named expat; use SimpleXMLTreeBuilder instead"
+                    )
+        parser = expat.ParserCreate(encoding, "}")
+        if target is None:
+            target = TreeBuilder()
+        # underscored names are provided for compatibility only
+        self.parser = self._parser = parser
+        self.target = self._target = target
+        self._error = expat.error
+        self._names = {} # name memo cache
+        # main callbacks
+        parser.DefaultHandlerExpand = self._default
+        if hasattr(target, 'start'):
+            parser.StartElementHandler = self._start
+        if hasattr(target, 'end'):
+            parser.EndElementHandler = self._end
+        if hasattr(target, 'data'):
+            parser.CharacterDataHandler = target.data
+        # miscellaneous callbacks
+        if hasattr(target, 'comment'):
+            parser.CommentHandler = target.comment
+        if hasattr(target, 'pi'):
+            parser.ProcessingInstructionHandler = target.pi
+        # Configure pyexpat: buffering, new-style attribute handling.
+        parser.buffer_text = 1
+        parser.ordered_attributes = 1
+        parser.specified_attributes = 1
+        self._doctype = None
+        self.entity = {}
+        try:
+            self.version = "Expat %d.%d.%d" % expat.version_info
+        except AttributeError:
+            pass # unknown
+
+    def _setevents(self, events_queue, events_to_report):
+        # Internal API for XMLPullParser
+        # events_to_report: a list of events to report during parsing (same as
+        # the *events* of XMLPullParser's constructor.
+        # events_queue: a list of actual parsing events that will be populated
+        # by the underlying parser.
+        #
+        parser = self._parser
+        append = events_queue.append
+        for event_name in events_to_report:
+            if event_name == "start":
+                parser.ordered_attributes = 1
+                parser.specified_attributes = 1
+                def handler(tag, attrib_in, event=event_name, append=append,
+                            start=self._start):
+                    append((event, start(tag, attrib_in)))
+                parser.StartElementHandler = handler
+            elif event_name == "end":
+                def handler(tag, event=event_name, append=append,
+                            end=self._end):
+                    append((event, end(tag)))
+                parser.EndElementHandler = handler
+            elif event_name == "start-ns":
+                def handler(prefix, uri, event=event_name, append=append):
+                    append((event, (prefix or "", uri or "")))
+                parser.StartNamespaceDeclHandler = handler
+            elif event_name == "end-ns":
+                def handler(prefix, event=event_name, append=append):
+                    append((event, None))
+                parser.EndNamespaceDeclHandler = handler
+            else:
+                raise ValueError("unknown event %r" % event_name)
+
+    def _raiseerror(self, value):
+        err = ParseError(value)
+        err.code = value.code
+        err.position = value.lineno, value.offset
+        raise err
+
+    def _fixname(self, key):
+        # expand qname, and convert name string to ascii, if possible
+        try:
+            name = self._names[key]
+        except KeyError:
+            name = key
+            if "}" in name:
+                name = "{" + name
+            self._names[key] = name
+        return name
+
+    def _start(self, tag, attr_list):
+        # Handler for expat's StartElementHandler. Since ordered_attributes
+        # is set, the attributes are reported as a list of alternating
+        # attribute name,value.
+        fixname = self._fixname
+        tag = fixname(tag)
+        attrib = {}
+        if attr_list:
+            for i in range(0, len(attr_list), 2):
+                attrib[fixname(attr_list[i])] = attr_list[i+1]
+        return self.target.start(tag, attrib)
+
+    def _end(self, tag):
+        return self.target.end(self._fixname(tag))
+
+    def _default(self, text):
+        prefix = text[:1]
+        if prefix == "&":
+            # deal with undefined entities
+            try:
+                data_handler = self.target.data
+            except AttributeError:
+                return
+            try:
+                data_handler(self.entity[text[1:-1]])
+            except KeyError:
+                from xml.parsers import expat
+                err = expat.error(
+                    "undefined entity %s: line %d, column %d" %
+                    (text, self.parser.ErrorLineNumber,
+                    self.parser.ErrorColumnNumber)
+                    )
+                err.code = 11 # XML_ERROR_UNDEFINED_ENTITY
+                err.lineno = self.parser.ErrorLineNumber
+                err.offset = self.parser.ErrorColumnNumber
+                raise err
+        elif prefix == "<" and text[:9] == "<!DOCTYPE":
+            self._doctype = [] # inside a doctype declaration
+        elif self._doctype is not None:
+            # parse doctype contents
+            if prefix == ">":
+                self._doctype = None
+                return
+            text = text.strip()
+            if not text:
+                return
+            self._doctype.append(text)
+            n = len(self._doctype)
+            if n > 2:
+                type = self._doctype[1]
+                if type == "PUBLIC" and n == 4:
+                    name, type, pubid, system = self._doctype
+                    if pubid:
+                        pubid = pubid[1:-1]
+                elif type == "SYSTEM" and n == 3:
+                    name, type, system = self._doctype
+                    pubid = None
+                else:
+                    return
+                if hasattr(self.target, "doctype"):
+                    self.target.doctype(name, pubid, system[1:-1])
+                elif self.doctype != self._XMLParser__doctype:
+                    # warn about deprecated call
+                    self._XMLParser__doctype(name, pubid, system[1:-1])
+                    self.doctype(name, pubid, system[1:-1])
+                self._doctype = None
+
+    def doctype(self, name, pubid, system):
+        """(Deprecated)  Handle doctype declaration
+
+        *name* is the Doctype name, *pubid* is the public identifier,
+        and *system* is the system identifier.
+
+        """
+        warnings.warn(
+            "This method of XMLParser is deprecated.  Define doctype() "
+            "method on the TreeBuilder target.",
+            DeprecationWarning,
+            )
+
+    # sentinel, if doctype is redefined in a subclass
+    __doctype = doctype
+
+    def feed(self, data):
+        """Feed encoded data to parser."""
+        try:
+            self.parser.Parse(data, 0)
+        except self._error as v:
+            self._raiseerror(v)
+
+    def close(self):
+        """Finish feeding data to parser and return element structure."""
+        try:
+            self.parser.Parse("", 1) # end of data
+        except self._error as v:
+            self._raiseerror(v)
+        try:
+            close_handler = self.target.close
+        except AttributeError:
+            pass
+        else:
+            return close_handler()
+        finally:
+            # get rid of circular references
+            del self.parser, self._parser
+            del self.target, self._target
+
+
+# Import the C accelerators
+try:
+    # Element is going to be shadowed by the C implementation. We need to keep
+    # the Python version of it accessible for some "creative" by external code
+    # (see tests)
+    _Element_Py = Element
+
+    # Element, SubElement, ParseError, TreeBuilder, XMLParser
+    from _elementtree import *
+except ImportError:
+    pass
diff --git a/modules/language/python/module/xml/etree/__init__.py b/modules/language/python/module/xml/etree/__init__.py
new file mode 100644
index 0000000..27fd8f6
--- /dev/null
+++ b/modules/language/python/module/xml/etree/__init__.py
@@ -0,0 +1,33 @@
+# $Id: __init__.py 3375 2008-02-13 08:05:08Z fredrik $
+# elementtree package
+
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2008 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
diff --git a/modules/language/python/module/xml/etree/cElementTree.py b/modules/language/python/module/xml/etree/cElementTree.py
new file mode 100644
index 0000000..368e679
--- /dev/null
+++ b/modules/language/python/module/xml/etree/cElementTree.py
@@ -0,0 +1,3 @@
+# Deprecated alias for xml.etree.ElementTree
+
+from xml.etree.ElementTree import *
diff --git a/modules/language/python/module/xml/parsers.py b/modules/language/python/module/xml/parsers.py
new file mode 100644
index 0000000..aee1b03
--- /dev/null
+++ b/modules/language/python/module/xml/parsers.py
@@ -0,0 +1,12 @@
+module(xml,parsers)
+
+"""Python interfaces to XML parsers.
+
+This package contains one module:
+
+expat -- Python wrapper for James Clark's Expat parser, with namespace
+         support.
+
+"""
+
+import xml.parsers.expat as expat