It should be mentioned that, despite the lack of an "official" set of
relationship values, there's long been a list of suggested values at
http://info.cern.ch/hypertext/WWW/MarkUp/Relationships.html
At least, that's where I've looked to find RELs that might have a
chance of being correctly interpreted in the future...
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Paul Burchard <burchard@math.utah.edu>
``I'm still learning how to count backwards from infinity...''
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