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Re: Negation decision : unexpected effects

From: Paul Gearon <gearon@ieee.org>
Date: Mon, 5 Apr 2010 17:56:59 -0400
Message-ID: <p2ha25ac1f1004051456kb2d5ef06o70d07f773dea0516@mail.gmail.com>
To: Andy Seaborne <andy.seaborne@talis.com>
Cc: Lee Feigenbaum <lee@thefigtrees.net>, SPARQL Working Group <public-rdf-dawg@w3.org>
On Mon, Apr 5, 2010 at 5:14 PM, Andy Seaborne <andy.seaborne@talis.com> wrote:
<snip/>
> For example:
>
> { ?s ?p ?o MINUS { SELECT (:s AS ?s){} } }
>
> removes the ?s=:s binding rows regardless of the contents of the graph.
>
> { ?s ?p ?o MINUS { ?x ?y ?z } }
>
> where the contents of the graph don't matter for the MINUS (if it's empty ?s
> ?p ?o is zero rows)

Sorry, I'm not clear on this. Are you saying that this just returns
the contents of the graph, and that the MINUS has no effect since
there are no matching variables?

Thanks,
Paul Gearon
Received on Monday, 5 April 2010 21:57:49 GMT

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