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Re: Aggregate extensibility

From: Axel Polleres <axel.polleres@deri.org>
Date: Tue, 30 Mar 2010 16:24:03 +0100
Cc: Orri Erling <erling@xs4all.nl>
Message-Id: <F98D7594-D0BD-4872-949B-8D3F51070A32@deri.org>
To: Ivan Mikhailov <imikhailov@openlinksw.com>, SPARQL Working Group <public-rdf-dawg@w3.org>

On 30 Mar 2010, at 15:26, Ivan Mikhailov wrote:

> Hello Axel,
> 
> > could you give me an example of a non-commutative aggregate?
> 
> The example is any report generator, such as traditional XMLAGG
> aggregate that makes an XML tree from its descendants.
> 
> > Would we also allow aggregates with arityy different to 1 (like common in functions) e.g. agg-uri(?X ?Y)
> 
> That's absolutely required for statistical calculations of all sorts,
> from regression to likelihood detection.
> 
> Best Regards,
> 
> Ivan.
> 
> 


BTW... also GROUP_CONCAT, right?
Received on Tuesday, 30 March 2010 15:24:39 GMT

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