Oh - I had missed that this one was problematic. Yes I agree this is a 
non-expert level query which should have clear semantics.


> On Jun 20, 2016, at 7:24 PM, Peter F. Patel-Schneider 
> <pfpschnei...@gmail.com> wrote:
> 
> 
> SELECT ?x WHERE { ?x :p :b .
>                  FILTER EXISTS { SELECT ?x WHERE { ?x :q :d . } } }

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