Support non-namespace elements in *ElementNS of XMLGenerator.

Lib/test/test_sax.py

@@ -112,11 +112,15 @@ def test_xmlgen_ns():
     gen.startDocument()
     gen.startPrefixMapping("ns1", ns_uri)
     gen.startElementNS((ns_uri, "doc"), "ns1:doc", {})
+    # add an unqualified name
+    gen.startElementNS((None, "udoc"), None, {})
+    gen.endElementNS((None, "udoc"), None)
     gen.endElementNS((ns_uri, "doc"), "ns1:doc")
     gen.endPrefixMapping("ns1")
     gen.endDocument()
 
-    return result.getvalue() == start + ('<ns1:doc xmlns:ns1="%s"></ns1:doc>' %
+    return result.getvalue() == start + \
+           ('<ns1:doc xmlns:ns1="%s"><udoc></udoc></ns1:doc>' %
                                          ns_uri)
 
 # ===== XMLFilterBase

Lib/xml/sax/saxutils.py

@@ -62,7 +62,12 @@ class XMLGenerator(handler.ContentHandler):
         self._out.write('</%s>' % name)
 
     def startElementNS(self, name, qname, attrs):
-        name = self._current_context[name[0]] + ":" + name[1]
+        if name[0] is None:
+            # if the name was not namespace-scoped, use the unqualified part
+            name = name[1]
+        else:
+            # else try to restore the original prefix from the namespace
+            name = self._current_context[name[0]] + ":" + name[1]
         self._out.write('<' + name)
 
         for pair in self._undeclared_ns_maps:
@@ -75,7 +80,10 @@ class XMLGenerator(handler.ContentHandler):
         self._out.write('>')
 
     def endElementNS(self, name, qname):
-        name = self._current_context[name[0]] + ":" + name[1]
+        if name[0] is None:
+            name = name[1]
+        else:
+            name = self._current_context[name[0]] + ":" + name[1]
         self._out.write('</%s>' % name)
         
     def characters(self, content):