This closes patch #102477.

Make Node inherit from xml.dom.Node to pick up the NodeType values
defined by the W3C recommendation.

When raising AttributeError, be sure to provide the name of the attribute
that does not exist.

Node.normalize():  Make sure we do not allow an empty text node to survive
                   as the first child; update the sibling links properly.

_getElementsByTagNameNSHelper():  Make recursive calls using the right
                                  number of parameters.

Attr.__setattr__():  Be sure to update name and nodeName at the same time
                     since they are synonyms for this node type.

AttributeList:  Renamed to NamedNodeMap (AttributeList maintained as an
                alias).  Compute the length attribute dynamically to allow
                the underlying structures to mutate.

AttributeList.item():  Call .keys() on the dictionary rather than using
                       self.keys() for performance.

AttributeList.setNamedItem(), .setNamedItemNS():
        Added methods.

Text.splitText():
        Added method.

DocumentType:
        Added implementation class.

DOMImplementation:
        Added implementation class.

Document.appendChild():  Do not allow a second document element to be added.

Document.documentElement:  Find this dynamically, so that one can be
        removed and another added.

Document.unlink():  Clear the doctype attribute.

_get_StringIO():  Only use the StringIO module; cStringIO does not support
                  Unicode.

objects; uses minidom if one is not provided to the constructor.

parse():  Pick up the default_bufsize default value dynamically so that
          the value in the module may be (meaningfully) changed at runtime.

This (partially) closes patch #102477.

(Thanks for the info, Tim!)

useful explanations.

DOM recommendation.

since the API documentation will state specifically that the specializations
must be used by the DOM implementations.

a prime size, which is in fact never true anymore ...).

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.

can't be imported.  This makes StringIO.py work with Jython.

Also, get rid of the string module by converting to string methods.

Shorten some lines by using augmented assignment where appropriate.

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.

2.1.3) finally agree on when the epoch is, so the code to convert
epochs has been disabled.

windows, but not on the mac. Fixed.

Pascal-strings. Safer, because Pstring converts in-place and the
pathname may be reused later for error messages.

happens because the scanner ignores preprocessor #ifs).

Py_FatalError on errors.

Allow /* */ comments within function prototypes.