Empty Property Citations

For #rdfms-empty-property-elements you may want to add:

>> Can properties have no value?
>> http://www.mailbase.ac.uk/lists/rdf-dev/1999-08/0001.html
>>     RRS says use a genid:
>>     http://www.mailbase.ac.uk/lists/rdf-dev/1999-09/0015.html
>>     Cowan says use empty literal:
>>     http://www.mailbase.ac.uk/lists/rdf-dev/1999-09/0016.html
> 
> Interesting that this should come up again recently.  I'll await a
> response to my response to the recent Sirpac Bug thread.

Hope this helps,

-- 
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