- From: Steve Harris <steve.harris@garlik.com>
- Date: Mon, 21 Dec 2009 17:50:02 +0000
- To: Olivier Corby <Olivier.Corby@sophia.inria.fr>
- Cc: Andy Seaborne <andy.seaborne@talis.com>, SPARQL Working Group <public-rdf-dawg@w3.org>
On 21 Dec 2009, at 15:51, Olivier Corby wrote: >> 8 Negation - Testing for the absence of a pattern >> >> I am not really happy that the EXISTS and NOT EXISTS pattern can be >> used >> in a filter. >> >> Could you say why that is? > > It is a feeling about language design. > Graph pattern is about graph match and filter is about evaluable > expressions. Here we mix both and that looks strange to me... I agree. Although SQL does it, it seems like a hack there too. For me it's the fact that you suddenly have graph patters inside a FILTER(). Does it add expressivity? - Steve
Received on Monday, 21 December 2009 17:50:35 UTC