Implementation of resolution of ISSUE-87 ("rational numbers")

Hi!

According to the chatlog of yesterday's telco, we have resolved ISSUE-87 by

    close ISSUE-87 by adding rational datatype 
    but marking it as at risk, 
    pending implementation experience

I have implemented this resolution in the RDF-Based Semantics:

 
<http://www.w3.org/2007/OWL/wiki/index.php?title=RDF-Based_Semantics&diff=15
400&oldid=15395>

@Boris: If you find a better approach or at least a better text for "marking
it at risk", please feel free to change my EdNote accordingly.

Michael

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Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Email: Michael.Schneider@fzi.de
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FZI Forschungszentrum Informatik an der Universität Karlsruhe
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