- From: Andy Seaborne <andy.seaborne@epimorphics.com>
- Date: Thu, 23 Sep 2010 08:36:26 +0100
- To: Axel Polleres <axel.polleres@deri.org>
- CC: SPARQL Working Group <public-rdf-dawg@w3.org>
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 07:37:02 UTC