Provenance service discovery in PROV-AQ

Hi,

I had an action (but no issue) to expand the discussion of provenance service 
discovery to take account of prov:hasProvenanceService.  I've done this, and 
added an example related to a VOiD dataset description.  Revised text is at:

http://dvcs.w3.org/hg/prov/raw-file/tip/paq/prov-aq.html#provenance-service-discovery

Feedback welcome.

#g
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