- From: Sven R. Kunze <sven.kunze@informatik.tu-chemnitz.de>
- Date: Wed, 25 Sep 2013 16:10:37 +0200
- To: public-lod@w3.org
- CC: Dave Reynolds <dave.e.reynolds@gmail.com>
On 09/25/2013 04:02 PM, Dave Reynolds wrote: > On 25/09/13 14:57, Sven R. Kunze wrote: >> On 09/25/2013 03:53 PM, Dave Reynolds wrote: >>> Hi Damian, >>> >>> On 25/09/13 14:16, Damian Steer wrote: >>>> On 25/09/13 12:03, Stuart Williams wrote: >>>>> On 25/09/2013 11:26, Hugh Glaser wrote: >>>>>> You'll get me using CONSTRUCT soon :-) >>>>>> (By the way, Tim's actual CONSTRUCT WHERE query isn't allowed >>>>>> because >>>>>> of the FILTER). >>>>> >>>>> Good catch... yes - I've been bitten by that kind of thing too... >>>>> that >>>>> not all that's admissible in a WHERE 'body', is admissible in a >>>>> CONSTRUCT 'body'. >>>> >>>> As far as I'm aware it is -- Tim's original simply misplaced a curly >>>> brace. The filter ought to be in the WHERE body. >>>> >>>> CONSTRUCT is essentially SELECT with a tabular data -> rdf system >>>> bolted >>>> at the end of the pipeline. >>> >>> I think the point people were making is that the syntactic shortform >>> "CONSTRUCT WHERE" with implicit template only applies when you have a >>> simple basic graph pattern [1]. >>> >>> If the WHERE clause is more complex, e.g. with a FILTER, then you need >>> an explicit construct template. >>> >>> Dave >>> >>> [1] http://www.w3.org/TR/sparql11-query/#constructWhere >>> >>> >> >> How did you come to that conclusion? > > Based on the part of the specification given by link [1] above, which > says (my emphasis): > > "A short form for the CONSTRUCT query form is provided for the case > where the template and the pattern are the same and the pattern is > just a basic graph pattern **(no FILTERs and no complex graph patterns > are allowed in the short form)**." > > Dave > I see, Dave. However, my intention was to understand the reason behind that decision. This quote is not a justification, just a description of what's expected to work. I can't see why restricting the set of where clauses is necessary. -- Sven R. Kunze Technische Universität Chemnitz Department of Computer Science Distributed and Self-organizing Systems Group Straße der Nationen 62 D-09107 Chemnitz Germany E-Mail: sven.kunze@informatik.tu-chemnitz.de WWW: http://vsr.informatik.tu-chemnitz.de/people/kunze Phone: +49 371 531 33882
Received on Wednesday, 25 September 2013 14:11:04 UTC