[XML-SIG] expat namespace_separator in Python 2.1

[Lars Marius Garshol]

* James Tauber
|
| The key issue that eikeon forgot to mention is that this is for RDF
| where namespaceURI+localName are concatenated to form property
| URIs. Without the ability to use '' we have to do a split+join on
| every element coming back from expat.

Well, if expat used to support this and it's useful for RDF I guess we
should do it. Sorry I was so slow in the uptake here.

--Lars M.