- From: Steve Harris <steve.harris@garlik.com>
- Date: Thu, 15 Oct 2009 17:28:24 +0100
- To: "public-rdf-dawg@w3.org Group" <public-rdf-dawg@w3.org>
I've been noodling on update today, and I have a couple of questions
for people who've already implemented it:
1) If you have DELETE { <a> <b> ?z . <c> <d> ?z } what does that mean?
The grammar allows it, but maybe it shouldn't? It could imply DELETE
{ <a> <b> ?z . <c> <d> ?z } WHERE { <a> <b> ?z . <c> <d> ?z }, but it
should be explicit what happens somewhere.
2) Can you delete bNodes with DATA? DELETE DATA { <a> <b> _:z }
doesn't really make much sense. Some stores (including Jena and
4store) allow you to quote bNodes like DELETE DATA { <a> <b> <_:z> }
but that's non-standard.
Without DATA you can do something like:
DELETE { <a> <b> ?z . <c> <d> ?z }
WHERE { <a> <b> ?z . <c> <d> ?z . FILTER(isBNODE(?z)) }
but that's really inconvenient, and will be hard to optimise if you
want to delete large chunks of data.
- Steve
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Steve Harris
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Received on Thursday, 15 October 2009 16:28:55 UTC