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Re: Aggregate extensibility

From: Ivan Mikhailov <imikhailov@openlinksw.com>
Date: Tue, 30 Mar 2010 21:26:26 +0700
To: Axel Polleres <axel.polleres@deri.org>
Cc: Orri Erling <erling@xs4all.nl>, SPARQL Working Group <public-rdf-dawg@w3.org>
Message-Id: <1269959186.3105.183.camel@octo.iv.dev.null>
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.
Received on Tuesday, 30 March 2010 14:27:04 GMT

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