Light Opensource XML framework

Hey,

I'm looking for a lightweight open source framework for validating XML documents against a DTD.
I've seen tinyXML, which is great, only it doesn't do the above.

Even a framework or library which does the complement of what tinyXML does would be fine.

Otherwise, just recommend some open source frameworks.

Thanks

Haven't used it much - http://xerces.apache.org/xerces-c/