Partial XSLT on grandchildren only?

Is it possible to use XALAN to only transform the
grandchildren of a XML document?

I want to load the XML file and manually iteratate
over the grandchildren of the document. Each
grandchild represents a page in a power-point like
presentation.

I don't want to tranform the entire document. I've had
trouble making the Microsoft DOM constrain itself to
only the grandchild node -- it climbs up (down,
actually) to the grandparent and transforms the whole
document, even when I only pass it the grand child
node. Does XALAN do this too?
 
   Thanks,
           Siegfried

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