[libxml++] Searching nodes with ns prefix

[togol m. <tog...@ly...>]

Dear Members,

I am facing the problem of finding nodes in an OWL file. The importance of =
registering the namespace before calling the find() function has been discu=
ssed before, but still the find function in libxml++ v2.12 does not support=
 this. I defined a new function as follows.

NodeSet Node::find_with_ns(const std::string& xpath, const std::string& ns_=
prefix, const std::string& uri) const
{
  xmlXPathContext* ctxt =3D xmlXPathNewContext(impl_->doc);
  if (!xmlXPathRegisterNs(ctxt, (const xmlChar*)ns_prefix.c_str(), (const x=
mlChar*)uri.c_str())){
	  std::cout << "Namespace registered successfully" << std::endl;
  }
  ctxt->node =3D impl_;
...=20

The "undefined namespace prefix" error message does not appear anymore, but=
 the node set is still empty. I call the find() function for the root node =
rdf:RDF of the owl document with the XPath expr //owl:Ontology. If I add a =
check to see whether the OWL namespace is already registered using xmlSearc=
hNs(), it returns the namespace pointer since for OWL, the namespace is alw=
ays defined in the root node.=20
Can somebody please point out where the problem is?
=20
Thanks,

Togol=20=20=20

--=20
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