Query on the XML graph

Jiang Ming Fei <[email protected]>
Newsgroups gmane.comp.web.query-languages
Message-ID <[email protected]> 
I am now doing the research on the XML graph. What I am wondering about is
that how the nowaday query engines cope with the XML files that have idref
attributes, or XML graph? Since XPath have no notation for the idref/id
edge. Or I miss some details?  So can I always treat the XML document as
a tree with the special node, i.e. idref node?

Thank you in advance for your suggestion.

Regards,
Fianny
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