- From: Steve Harris <steve.harris@garlik.com>
- Date: Mon, 27 Sep 2010 15:53:06 +0100
- To: Lee Feigenbaum <lee@thefigtrees.net>
- Cc: Andy Seaborne <andy.seaborne@epimorphics.com>, Axel Polleres <axel.polleres@deri.org>, SPARQL Working Group <public-rdf-dawg@w3.org>
On 2010-09-27, at 13:54, Lee Feigenbaum wrote:
> On 9/27/2010 8:20 AM, Steve Harris wrote:
>> On 2010-09-23, at 08:36, 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.
>>
>> Yeah, I went for a non-list value so there was no possibility of it being the same as a "real" key, but it's perhaps not as clear as it should be.
>
> Maybe it would be clearer if you used one of these guys?
>
> http://unicodesnowmanforyou.com/
Heh, I considered introducing another symbol, but SPARQL has it's fair share already.
- Steve
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Received on Monday, 27 September 2010 14:54:17 UTC