- From: Axel Polleres <axel.polleres@deri.org>
- Date: Thu, 23 Sep 2010 09:46:21 +0200
- To: "Andy Seaborne" <andy.seaborne@epimorphics.com>
- Cc: "SPARQL Working Group" <public-rdf-dawg@w3.org>
Thanks for clarification, an explaining remark in the doc might help.
Axel
On 23 Sep 2010, at 09:36, Andy Seaborne wrote:
>
>
> On 22/09/10 06:59, Axel Polleres wrote:
> > I have a small question about the Definition of "Group" in the query draft:
> >
> > "Group((),Ω) = { 1 -> Ω }"
> >
> > ... shouldn't that be:
> >
> > "Group((),Ω) = { () -> Ω }"
> >
> > i.e., what is the 1 supposed to mean?
>
> The 1 is any key. When the set of groups keys is the empty, which
> happnes for
>
> SELECT (count(*) AS ?c) { ?s ?p ?o }
>
> then there needs to be a key value for the group.
>
> It could be said to be slightly more sense to be (1), not 1, as it's a
> list when then the key isn't empty. The key just needs to be unique,
> and here, there is only one key so it's arbitrary.
>
> Andy
>
> >
> > Thanks for clarification,
> > Axel
> >
> >
> >
> >
>
Received on Thursday, 23 September 2010 07:47:06 UTC