W3C home > Mailing lists > Public > public-sparql-dev@w3.org > July to September 2013

RE: Wishlist for SPARQL 1.2: Compatible query-hints, extra math operators

From: william greenly <william_greenly@hotmail.com>
Date: Tue, 30 Jul 2013 15:15:48 +0100
Message-ID: <DUB111-W394AA6AB706491AD9783485560@phx.gbl>
To: "jerven.bolleman@isb-sib.ch" <jerven.bolleman@isb-sib.ch>, "public-sparql-dev@w3.org" <public-sparql-dev@w3.org>, "public-rdf-dawg-comments@w3.org" <public-rdf-dawg-comments@w3.org>, Kingsley Idehen <kidehen@openlinksw.com>, Bryan Thompson <bryan@systap.com>
Excellent - Yes! SPARQL 1.2. If we want to follow in the footsteps of SPARQL 1.1 we should ensure 1.2 has lots of major changes in protest against semantic versioning.
 
> Date: Tue, 30 Jul 2013 16:05:27 +0200
> From: jerven.bolleman@isb-sib.ch
> To: public-sparql-dev@w3.org; public-rdf-dawg-comments@w3.org; kidehen@openlinksw.com; bryan@systap.com
> Subject: Wishlist for SPARQL 1.2: Compatible query-hints, extra math operators
> 
> Dear Workgroup, All,
> 
> Maybe not the best moment to bring this up as the ink on SPARQL 1.1 is 
> not even dry yet. But looking to the future could we start thinking 
> about SPARQL 1.2 and what could be standardized there.
> 
> The first need I am seeing is the need to standardize query hints.
> 
> Oracle uses extra prefix declarations for query hints [1].
> BigData uses magic BGP's [2]
> Virtuoso introduced a new keyword ASSUME [3]
> 
> The BigData and Virtuoso approach introduce query incompatibilities 
> which is unfortunate. Oracle is ok in this respect as the unused 
> prefixes won't affect any strictly compatible sparql engine. I like the 
> idea that any SPARQL query will run on any store the only thing changing 
> is speed. Extra keywords or non existing BGP's break this utopia :(
> 
> The second is an expansion of the basic math operators to include at 
> least (square)root. (square)root is very hard to implement using the 
> current SPARQL constructs yet is a very useful function. (even if not exact)
> 
> Regards,
> Jerven
> 
> 
> 
> [1] 
> http://docs.oracle.com/cd/E18283_01/appdev.112/e11828/sem_jena.htm#CBBIAGAF
> [2] http://sourceforge.net/apps/mediawiki/bigdata/index.php?title=QueryHints
> [3] 
> http://sourceforge.net/mailarchive/forum.php?thread_name=51F67BB8.7030302%40openlinksw.com&forum_name=virtuoso-users
> 
> 
> 
> 
> -- 
> -------------------------------------------------------------------
>   Jerven Bolleman                        Jerven.Bolleman@isb-sib.ch
>   SIB Swiss Institute of Bioinformatics  Tel: +41 (0)22 379 58 85
>   CMU, rue Michel Servet 1               Fax: +41 (0)22 379 58 58
>   1211 Geneve 4,
>   Switzerland     www.isb-sib.ch - www.uniprot.org
>   Follow us at https://twitter.com/#!/uniprot
> -------------------------------------------------------------------
> 
 		 	   		  
Received on Tuesday, 30 July 2013 14:16:20 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 20:15:52 UTC