doc() and docref() relative to source document

After reading the latest working draft, I have a question 
about doc() and docref().

According to my understanding of the spec, the URI reference 
is mapped relative the stylesheet.  How do you reference 
documents relative to the source document?  

As near as I can tell, (I haven't had time to play with the
latest xt yet) there isn't even a standard way to get the
element base-URI.  So, I can't even think of a generic way 
of extending an XSL processor to retrieve relative URLs in
the source document.

Am I missing something?


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