expunge the xmlcore changes:

41667, 41668 - initial switch to xmlcore
  47044        - mention of xmlcore in What's New
  50687        - mention of xmlcore in the library reference

re-apply xmlcore changes to xml:
  41674        - line ending changes (re-applied manually), directory props
  41677        - add cElementTree wrapper
  41678        - PSF licensing for etree
  41812        - whitespace normalization
  42724        - fix svn:eol-style settings
  43681, 43682 - remove Python version-compatibility cruft from minidom
  46773        - fix encoding of \r\n\t in attr values in saxutils
  47269        - added XMLParser alias for cElementTree compatibility

additional tests were added in Lib/test/test_sax.py that failed with
the xmlcore changes; these relate to SF bugs #1511497, #1513611

Lib/test/test_sax.py

@@ -1,17 +1,17 @@
 # regression test for SAX 2.0            -*- coding: iso-8859-1 -*-
 # $Id$
 
-from xmlcore.sax import make_parser, ContentHandler, \
-     SAXException, SAXReaderNotAvailable, SAXParseException
+from xml.sax import make_parser, ContentHandler, \
+                    SAXException, SAXReaderNotAvailable, SAXParseException
 try:
     make_parser()
 except SAXReaderNotAvailable:
     # don't try to test this module if we cannot create a parser
     raise ImportError("no XML parsers available")
-from xmlcore.sax.saxutils import XMLGenerator, escape, unescape, quoteattr, \
-     XMLFilterBase
-from xmlcore.sax.expatreader import create_parser
-from xmlcore.sax.xmlreader import InputSource, AttributesImpl, AttributesNSImpl
+from xml.sax.saxutils import XMLGenerator, escape, unescape, quoteattr, \
+                             XMLFilterBase
+from xml.sax.expatreader import create_parser
+from xml.sax.xmlreader import InputSource, AttributesImpl, AttributesNSImpl
 from cStringIO import StringIO
 from test.test_support import verify, verbose, TestFailed, findfile
 import os
@@ -36,17 +36,17 @@ def test_make_parser2():
         # Creating parsers several times in a row should succeed.
         # Testing this because there have been failures of this kind
         # before.
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
-        from xmlcore.sax import make_parser
+        from xml.sax import make_parser
         p = make_parser()
     except:
         return 0
@@ -108,7 +108,7 @@ def test_make_parser():
     try:
         # Creating a parser should succeed - it should fall back
         # to the expatreader
-        p = make_parser(['xmlcore.parsers.no_such_parser'])
+        p = make_parser(['xml.parsers.no_such_parser'])
     except:
         return 0
     else:
@@ -671,6 +671,55 @@ def test_nsattrs_wattr():
            attrs.getQNameByName((ns_uri, "attr")) == "ns:attr"
 
 
+# During the development of Python 2.5, an attempt to move the "xml"
+# package implementation to a new package ("xmlcore") proved painful.
+# The goal of this change was to allow applications to be able to
+# obtain and rely on behavior in the standard library implementation
+# of the XML support without needing to be concerned about the
+# availability of the PyXML implementation.
+#
+# While the existing import hackery in Lib/xml/__init__.py can cause
+# PyXML's _xmlpus package to supplant the "xml" package, that only
+# works because either implementation uses the "xml" package name for
+# imports.
+#
+# The move resulted in a number of problems related to the fact that
+# the import machinery's "package context" is based on the name that's
+# being imported rather than the __name__ of the actual package
+# containment; it wasn't possible for the "xml" package to be replaced
+# by a simple module that indirected imports to the "xmlcore" package.
+#
+# The following two tests exercised bugs that were introduced in that
+# attempt.  Keeping these tests around will help detect problems with
+# other attempts to provide reliable access to the standard library's
+# implementation of the XML support.
+
+def test_sf_1511497():
+    # Bug report: http://www.python.org/sf/1511497
+    import sys
+    old_modules = sys.modules.copy()
+    for modname in sys.modules.keys():
+        if modname.startswith("xml."):
+            del sys.modules[modname]
+    try:
+        import xml.sax.expatreader
+        module = xml.sax.expatreader
+        return module.__name__ == "xml.sax.expatreader"
+    finally:
+        sys.modules.update(old_modules)
+
+def test_sf_1513611():
+    # Bug report: http://www.python.org/sf/1513611
+    sio = StringIO("invalid")
+    parser = make_parser()
+    from xml.sax import SAXParseException
+    try:
+        parser.parse(sio)
+    except SAXParseException:
+        return True
+    else:
+        return False
+
 # ===== Main program
 
 def make_test_output():