XPath support?

[kj]

I'm looking for a XML parser that produces an object with full
XPath support.  What I've been using up to now, xml.etree.ElementTree,
fails to support Xpath predicates, as in "spam[@eggs='3']/ham".

What I'm trying to do is to read-in a large XML string, and parse
it into an object from which I can extract nodes matching selectors
that include such predicates.

Any suggestions would be greatly appreciated.

TIA!

kynn