Hi,
i need to use the xpath.evaluate method, but instead of passing an InputSource i'm trying to pass a Document (because a i want to do various evalutes, and it takes less time if i just pass the parsed Document)
I have this code

Document document = DocumentBuilderFactory.newInstance().newDocumentBu ilder().parse("rdf.xml");

String expr = "/rdf:RDF/rdf:Description/prf:component/rdf:Description/prf:CcppAccept/rdf:Bag/rdf:li='image/vnd.wap.wbmp'";

XPath xpath = XPathFactory.newInstance().newXPath();
xpath.setNamespaceContext(new TesteNameSpace(rdf));

String result = xpath.evaluate(expr,document);

The result is false, but it should be true
If i do the same thing, but instead of passing a Document, i pass an InputSource, it work perfectly
My problem is that it used to work with a document object, but now it doesn't and i didn't change a thing
Does anyone have a clue?
Thanks

Have you provided mappings for the other all namespace URIs? The ones mapped to prefixes "rdf" and "prf".
Where is rdf defined in: --

Joe (Microsoft MVP - XML)

Thanks for your post, but i finally found out what was wrong.
rdf is the first node it's like = document.getElementsByTagName("rdf:RDF").item(0);
(this isn't the actual code, because i check for erros and all, but it's the simplified version)
The uri mappings are given in the TestNameSpace, the construct read the xmlns attributes from the rdf node (explained above) and stores 3 variables, then when i need a prefix it does this
if(prefix.compareToIgnoreCase("rdf") == 0)
    return rdf;
else if(prefix.compareToIgnoreCase("prf") == 0)
    return prf;
else if(prefix.compareToIgnoreCase("mms") == 0)
    return mms;
return null;

Now for the resolution, actually it was quite simple, but i still don't quite understand the reason.
The problem was with the expression, in my code i had several expressions, for example
String expr = "rdf:RDF/rdf:Description/prf:component/rdf:Description/prf:Vendor/text()";

this worked fine with the InputSource, but with a document, i had to take out the prefixes, so i had to evaluate

String expr = "RDF/Description/component/Description/Vendor/text()";

And this worked