How to create a xpath context from a node - libxml

[mariano_donati]

I need to evaluate a xpath expression within a given node context, not the entire document. I'm able to create the document context with xmlXPathNewContext. However it expects a document pointer and I can't find a similar function to accept any node pointer and returns a valid xpath context.
Is there any? I could find this:

xmlXPathNewParserContext(const xmlChar *str, xmlXPathContextPtr ctxt)

But I can't figure it out the right parameters.

[franium]

Originally Posted by mariano_donati

I need to evaluate a xpath expression within a given node context, not the entire document. I'm able to create the document context with xmlXPathNewContext. However it expects a document pointer and I can't find a similar function to accept any node pointer and returns a valid xpath context.
Is there any? I could find this:

xmlXPathNewParserContext(const xmlChar *str, xmlXPathContextPtr ctxt)

But I can't figure it out the right parameters.

Did you succeed in finding a solution?
I'm trying to modify the Matt Gallagher functions and I need something like xmlXPathNewContext on a xmlNodePtr.
Thanks in advance,
Fran