are SOURCE consumers OK with it being optional?

Dave, I don't recall getting a reply to my questions
about your source proposal...
http://lists.w3.org/Archives/Public/public-rdf-dawg/2004OctDec/0256.html

In particular,

 I think you're suggesting that there are 2 query results for queries
 that use SOURCE and that implementations are free to return
 either. Is that right?

Or perhaps there are 2^N correct results, where N is the
number of SOURCE clauses.

And now a question to the customers...
For the use cases where SOURCE is used, is that going to work?
i.e. when they send a SOURCE query, is it OK if they sometimes
get a source and sometimes don't?


-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
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