W3C home > Mailing lists > Public > public-rdf-dawg@w3.org > October to December 2009

RE: The syntax of the SELECT clause.

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Fri, 30 Oct 2009 16:51:11 +0000
To: SPARQL Working Group <public-rdf-dawg@w3.org>
Message-ID: <B6CF1054FDC8B845BF93A6645D19BEA3694058EFC0@GVW1118EXC.americas.hpqcorp.net>
Update:

> * ARC
> 
> SELECT ?x ?y count(?a) AS ?z
> 
> AS only with aggregates.

ARC2 now supports [1] this style of select expressions:

SELECT ?x ?y (count(?a) AS ?z)

	Andy

[1] http://twitter.com/bengee/status/5018460858


> -----Original Message-----
> From: public-rdf-dawg-request@w3.org [mailto:public-rdf-dawg-request@w3.org]
> On Behalf Of Seaborne, Andy
> Sent: 14 September 2009 12:26
> To: SPARQL Working Group
> Subject: The syntax of the SELECT clause.
> 
> Deciding on syntax can be a painful matter because once the basic technical
> issues are dealt with it comes down to aesthetics.
> 
> We will have to come to a decision on the SELECT expression syntax sometime
> (it's not needed for FPWD) so I have taken a look at as many systems that
> have been mentioned or I can find.  In each case, I have tried to go back to
> the definitive grammar, or failing that, what I think is the definitive
> documentation.  As such, the survey is bias to open source.
> 
> References used are listed at the end of the message.
> 
> Dimension of the designs include:
> * Does the term after AS include the ? or not.
> * Does the AS appear inside or outside any ().
> * Allowing optional commas. The examples below don't show that.
> 
> Please add systems to the list and make corrections on the wiki:
> http://www.w3.org/2009/sparql/wiki/Design:Project_Expression#Survey_of_syntax

> _forms_in_deployed_systems
> 
> 	Andy
> 
> * Glitter
> 
> SELECT ?x ?y (?x+?y AS ?z)
> 
> * ARQ
> 
> SELECT ?x ?y (?x+?y AS ?z)
> 
> * RDF::Query
> 
> SELECT ?x ?y (?x+?y AS ?z)
> 
> * Virtuoso
> 
> Optional commas
> () required with AS
> 
> SELECT ?x ?y (?x+?y) AS ?z
> SELECT ?x ?y (?x) AS ?z
> 
> * Redland:RASQAL
> 
> 4Store uses RASQAL.
> Optional commas
> () required with AS
> 
> SELECT ?x ?y (?x+?y) AS z
> 
> * ARC
> 
> SELECT ?x ?y count(?a) AS ?z
> 
> AS only with aggregates.
> 
> * Sesame:
> I found a contributed parser (due to Jeen?) with
> 
> SELECT ?x ?y datatype(?a) AS "z"
> 
> ----
> Steve has proposed mandating commas in a SELECT form when an expression or AS
> is used.
> 
> SELECT ?x ?y ?z
> SELECT ?x , ?y , count(?a) AS ?z
> ----
> 
> 
> References:
> 
> RDF::Query
> http://cpansearch.perl.org/src/GWILLIAMS/RDF-Query-

> 2.200/lib/RDF/Query/Parser/SPARQLP.pm
> 
> Glitter:
> http://svn.openanzo.org/svn/openanzo/openanzo/trunk/org.openanzo.rdf/grammar/

> sparql.jj
> 
> ARQ:
> http://jena.svn.sourceforge.net/viewvc/jena/ARQ/trunk/Grammar/arq.jj

> 
> RASQAL:
> http://svn.librdf.org/view/*checkout*/rasqal/trunk/src/sparql_parser.y

> 
> ARC2:
> http://code.semsol.org/source/arc/parsers/ARC2_SPARQLPlusParser.php

> 
> Virtuoso:
> http://docs.openlinksw.com/virtuoso/rdfsparqlimplementationextent.html

> 
> Sesame:
> http://repo.aduna-software.org/svn/org.openrdf/sesame-

> ext/sparqlplus/trunk/src/main/java/org/openrdf/query/parser/sparqlplus/ast/sp
> arql+.jjt

Received on Friday, 30 October 2009 16:52:25 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 16:15:40 GMT