Merge with PyXML 1.80:

Basic minidom changes to support the new higher-performance builder, as
described: http://mail.python.org/pipermail/xml-sig/2002-February/007217.html

Use True/False where appropriate.

isSupported():  Implemented from DOM Level 2.

Support a variety of things from the DOM Level 3 draft, integrate with
the xml.dom.xmlbuilder module for the new Document and
DOMImplementation methods.

Support the NODE_CLONED callback for the UserDataHandler set using
setUserData().

Add Entity and Notation nodes to minidom.
Add __getitem__() to ReadOnlySequentialNamedNodeMap to match NamedNodeMap.
TupleType was used without being defined; rename to _TupleType and define.

Add magic so that instances of the NamedNodeMap (and its read-only cousin)
take a bit less memory in the new-style world of Python 2.2/2.3.  Now, the
assignments to __slots__ actually work.  ;-)

Add support for the Text.wholeText attribute.
Document.createCDATASection():  Do not pass unsupported arg to CDATASection
constructor.

Implemented Text.replaceWholeText().

Updated minidom interfaces to work better with current 4Suite XPath and Xslt.
* Added childNodes to class Attr
* Added localName and prefix to all Nodes
* Added specified on class Attr
* Changed DOMImplementation.createDocument to all creating a document with no document element and
a
Null doctype
* Changed CharacterData__setattr__ to keep nodeValue and data in synch
* fixed typo of ownerDoc in createDocumentFragment
* Changed Comment to inherit from CharacterData
* Allowed mutation of name on PIs
* Added importNode and rewrote cloneNode so both use same code base
* Changed EmptyNodeList to be a list not a tuple

Use a table-driven DOMImplementation.hasFeature().
Shorten lines longer than 80 characters.

Rename CloneNode to _clone_node (better naming consistency within the
module).

When defining localName as a property, the defproperty() call is
needed for each class that defined _get_localName(), otherwise only
the first version is used for Python 2.2 and newer.

Node.insertBefore():  When the reference node is not found, raise the
    exception defined by the DOM specification.

Attr._set_value():  Added setter that does the right thing.

Childless.removeChild():  Raise the exception defined by the
    specification, even though it seem less than intuitive.

_clone_node():  Access nodeType constants so we actually find them.
    Add support for document fragments.

Node.removeChild(), .replaceChild():
    Fix exception raised when a reference node is not found.

CharacterData._set_data():  Update the nodeValue attribute as well as
    the data attribute.

Entity.attributes, .childNodes:  Added these attributes.

Document.removeChild():  Raise the right exception when the node being
    removed is not a child of this node.

Element.removeAttributeNode():  Raise the right exception when the
    node isn't present on this element.  Don't unlink the node unless
    it is present.

Added support for the following methods and accessors:
    Node._get_childNodes(), Attr._get_specified(), Attr._set_prefix(),
    NamedNodeMap.has_key(), .getNamedItem(), .getNamedItemNS(),
    .removeNamedItem(), .removeNamedItemNS(),
    ProcessingInstruction._get_data(), ._get_target(), ._set_data(),
    ._set_target(), CharacterData.__len__(),
    Document.getElementById().

Add many more of the _get_*() accessors.

Convert internal helpers to use a more consistent naming convention.

Remove unused definition of _nssplit(); there can be only one!

Move the Identified mixin up so it can be used by one more class.

Remove comment about NamedNodeMap.__getitem__(); the API won't be
changing now!  Way too late for that.

Preliminary support for getElementById() for DOMs built with
xml.dom.expatbuilder.
Not necessarily very efficient, but it works, and is still fast for Document
instances that do not have the ID information.

DOMImplementation.createDocument():  Don't forget to add the
    DocumentType node to the tree.  This appearantly was lost in the
    previous release.

DocumentType.writexml():  New function.

Implement the final determination on the behaviors of importNode() and
cloneNode() with regard to Document and DocumentType nodes.

When cloning and importing, call the UserDataHandler with the right
operation, not just blindly use NODE_CLONED.

parse(), parseString():  When called with parser=None, use
xml.dom.expatbuilder instead of xml.dom.pulldom, to get a performance
boost (the main point of expatbuilder).

Fix for calling parse / parseString with a given parser instance;
the else-paths were ignored when refactoring the function signatures;
pychecker found that error instantly, BTW (hint, hint)

Added pickle support for NamedNodeMap, ReadOnlySequentialNamedNodeMap,
and ElementInfo. Closes SF bug #609641.

In _clone_node for elements, fixed arguments for getAttributeNodeNS

At least make sure the DOM API won't allow you to modify the child
node list of an entity node (since entity ndoes are supposed to be
readonly).

Add support for the DOM Level 3 (draft) DOMImplementationSource interface
to the xml.dom and xml.dom.minidom modules.  Note API issue: the draft spec
says to return null when there is no suitable implementation, while the
Python getDOMImplementation() function raises ImportError (minor).

Implement the DOM Level 3 Attr.isId property.
Refactor the lookup of the ElementInfo objects.

Implement the schemaType attribute for Element and Attr nodes.
Defined by the (draft) DOM Level 3 specification.

getElementById():  Support caching of IDs found.  This implementation is
    sufficient for DOM Level 2 compliance, but additional changes will be
    needed to support the setIdAttribute() and setIdAttributeNS() methods
    in DOM Level 3.

Add support for Text.isWhitespaceInElementContent (draft Level 3).

NamedNodeMap.removeNamedItem(), .removeNamedItemNS():
    Pass the new tests:  Return the removed node, or raise NotFoundErr
    if there was no matching node.

When changing attributes via a NamedNodeMap, update the ID-cache
appropriately.

Added support for the DOM Level 3 (draft) Element.setIdAttribute*() methods.

setAttributeNode():  Be more careful about not calling
    removeAttributeNode() twice for a single node.

Do more to avoid creating new Attr nodes, so that attributes do not lose
their ID-ness when set using setIdAttribute*().

Work harder to avoid calls to Attr.__setattr__() and
CharacterData.__setattr__().

Attr.unlink():
    Implement everything directly instead of calling to the base
    class, which does several things that aren't needed for Attr
    nodes.

Change some remaining assignments that caused __setattr__() to be
called when it can be avoided.  expatbuilder can now perform DOM
construction without __setattr__() interferance in common cases.

Remove unused _make_parent_nodes logic.