[xml] Most portable xml library?

[richardcavell mail com]

Hi, everyone.

I'm writing a Wikipedia bot in C.  It is designed to be as standard and 
portable as possible.  I'm looking for an XML library to parse the 
output of Wikipedia requests.  The tasks are in fact very simple.  For 
example, look at the login result item here:

http://www.mediawiki.org/wiki/API:Login

My bot currently does XML parsing with <string.h> and does it 
correctly.  But it's not the pro way to do it.

Is libxml2 the most portable XML library?

And is there example code for extracting individual items from the 
result?  I don't desire to parse the entire document.