Re: [jena-dev] COUNT syntax

Andy --

[apologies for cross posting -- this seems, well, important]

You wrote...

The working group is just finishing up so "official" [syntax and semantics
for SPARQL aggregation] will have to wait for rechartering.

SQL made the mistake of not standardizing the semantics of aggregation, and
it seems a shame that SPARQL is going down the same road.  In particular, it
makes it difficult to automatically generate SQL or SPARQL queries from
higher level stuff.

Is there anyone in W3C who can be persuaded  that this is a higher priority
item?

                                    Cheers,  -- Adrian

Internet Business Logic
A Wiki and SOA Endpoint for Executable Open Vocabulary English
Online at www.reengineeringllc.com    Shared use is free

Adrian Walker
Reengineering


On 12/3/07, Andreas Langegger <al@jku.at> wrote:
>
>   Hello,
>
> it has already been noted that there are different syntax styles
> around for aggregate functions like COUNT which are out of scope of
> the SPARQL Rec:
>
> https://www.blogger.com/comment.g?blogID=18002060&postID=4691605369637965896
>
> In my case it's also an issue. The problem is, even if I just use a
> "SELECT COUNT(*)" without additional parentheses - which should work
> for both ARQ and Virtuoso (DBpedia e.g.) - ARQ will add the ARQ-style
> parentheses when serializing the Query back into a String: "SELECT
> (COUNT(*))" e.g. when executing remote queries...
>
> I'd like to here some comments and appraisal from the community. Is
> there a chance that aggregate functions become part of official
> SPARQL? When? ;-)
>
> A possible solution for ARQ would be to add a Syntax.syntaxVirtuoso,
> however this is not really a solution for this issue.
>
> Thanks,
> Andy
>
> PS@ Andy Seaborne:
> Concerning my remote-bug - it was my fault. However I was already
> confused enough cause I had another strange behavior with D2R
> resulting in empty variable mappings when joining. Switched off the
> optimizer sinze I'm using some custom Transforms... now it's working.
> Thanks a lot and sorry for the false alarm!
>
> ----------------------------------------------------------
> Dipl.-Ing.(FH) Andreas Langegger
> Institute for Applied Knowledge Processing
> Johannes Kepler University Linz
> A-4040 Linz, Altenberger Strafle 69
> http://www.faw.at
> http://www.langegger.at
>
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