URI Callback?

[Kelly Graus]

I am working on a code framework that has a fairly robust set of stream 
classes that allow us to access data from several different sources (ie, 
files, network files, zip files, executable resources, databases, etc) 
using a simple path based syntax.  I am currently adding Xalan based 
transformations to the framework, and would like the ability to be able 
to load the xsl files using our stream classes instead of the classes 
that Xalan provides.  So far, I am able to do this by using our stream 
classes to read a single xsl file into memory, then using a 
std::stringstream to create a XalanInputSource.  However, several of our 
transforms reference other transforms. 

For example, I might have a zip file that contains someFile.xml, 
transform1.xsl, and transform2.xsl.  The transform1.xsl file contains a 
<xsl:include href="transform2.xsl"/> tag.  Our stream classes allow us 
to read directly from the zip file, so I can read transform1.xsl into 
memory and use it to transform someFile.xml.  Obviously, Xalan doesn't 
know how to read transform2.xsl from the zip file, so this won't work.  
Is there a way to plug in a class I write that Xalan can use to resolve 
relative URIs?

Thanks for any help!
Kelly

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