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Further comments on SPARQL 1.1

From: Rob Vesse <rav08r@ecs.soton.ac.uk>
Date: Thu, 25 Feb 2010 15:24:31 -0000
To: <public-rdf-dawg-comments@w3.org>
Message-ID: <EMEW3|96cd97a82f19f651020153e11b9653bdm1OFOX06rav08r|ecs.soton.ac.uk|004001cab62e$a0c5d130$e2517390$@soton.ac.uk>
With regards to my previous comments and the Working Group's response [1] I
would like to make some further comments.


Aggregates - I do not like the proposed SEPARATOR syntax for GROUP_CONCAT at
all, if you are going to include GROUP_CONCAT simply leave it as a single
argument with a standard separator and then specify that fn:string-join()
must be supported by SPARQL 1.1 as a function since I believe the WG intends
to specify a subset of XPath and other common functions that implementations
should support?


Property Paths - Having asked Steve Harris for clarification of this
off-list I'd like to make the following comment about simple property paths.
The draft states that simple paths can be transformed to algebra expressions
and executed as such (I've implemented this in my implementation) but the
specification also states that property paths should eliminate duplicates.
In the case where paths can be transformed to a BGP is it still necessary to
eliminate duplicates?


Rob Vesse


PhD Student

IAM Group

Bay 20, Room 4027, Building 32

Electronics & Computer Science

University of Southampton

SO17 1BJ


[1] http://www.w3.org/2009/sparql/wiki/CommentResponse:RV-2

Received on Friday, 26 February 2010 13:51:41 UTC

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