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RE: [ACTION-18] use case on !ASK in FILTERS to emulate negation

From: Ivan Mikhailov <imikhailov@openlinksw.com>
Date: Mon, 25 May 2009 03:05:02 +0700
To: "Seaborne, Andy" <andy.seaborne@hp.com>
Cc: Axel Polleres <axel.polleres@deri.org>, "public-rdf-dawg@w3.org" <public-rdf-dawg@w3.org>
Message-Id: <1243195502.9978.390.camel@octo.iv.dev.null>
> WHERE { ?x foaf:givenName  ?name .
>         !EXISTS { ?x dc:date ?date }
>       }

Maybe '!' should get 'NOT' synonym, for readability?

In addition, I still think that EXISTS without FILTER around are a bit
confusing, esp. if the next clause is OPTIONAL {...}.

Best Regards,

Ivan.
Received on Sunday, 24 May 2009 20:05:47 GMT

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