cannot find the namespace declarations from an extension function

Hi all,

I am using Xalan 2.7.0. I am writing a large XSL application which 
processes WSDL files. Because of the nature of WSDL files, this 
processing requires a complex loop declaration just to traverse a 
reference. Right now, the code looks like this:

<!-- key for looking up the wsdl:binding -->
<variable name="binding-key">
   <apply-templates select="." mode="binding-key" />
</variable>

<for-each select="key('binding',$binding-key)">
...
</for-each>

Imagine few nested loops like the one above...
Hence, I want to simplify the code to look like:

<for-each select="myxslutils:ref(/wsdl:definitions/wsdl:binding,
   'name', @binding, /wsdl:definitions/@targetNamespace)">
...
</for-each>

Somewhere in my extension function I need to extract the namespace URI 
of a given prefix. I tried the node.lookupNamespaceURI(prefix) method 
but it returns with a null value :( Tried it on the root element also 
and got the same result. Tried to enumerate the attributes of the root 
element and the namespace attributes are not returned -- any clues?

The WSDL document is read using this method:

transformer.transform(new StreamSource(reader),
             new StreamResult(writer));

where reader is a java.io.FileReader.

It seems like the namespace declarations are missing from the parse 
tree. OTH, the transformations depend on these namespace declarations 
and they work as expected.

Please help,
Adrian.