[xml] Xpath question

["Yong Chen (yongche)" <chen cisco com>]

Hi,

I plan to use xpath in libxml2 to get a subset of a xmldoc, I know it
can be done by calling xmlXPathEvalExpression(), the result is a
xmlXPathObjectPtr which has a "nodesetval" member pointing to selected
nodes (of type xmlNodeSetPtr).

My question is, after getting the selected nodes, is there any API I can
call to dump the selected nodes in xml tree format? There is a
convenient API xmlDocDump(stdout, doc) to dump the whole doc in xml tree
format, I'm looking for something like xmlDocDumpSubset(doc,
selected-nodes) to dump only the selected nodes in the doc.

If no such API available, any suggestion for achieving this?

Thanks,
Yong Chen