W3C home > Mailing lists > Public > public-sparql-dev@w3.org > April to June 2012

Re: SPARQL 1.1. BINDINGS + FILTER

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Wed, 02 May 2012 11:17:39 +0100
Message-ID: <4FA109C3.9070301@epimorphics.com>
To: bn@kasabi.com, aidan.hogan@deri.org, sallen@apache.org
CC: public-sparql-dev@w3.org
Hi guys,
cc: public-sparql-dev

I thought you might like to know what's going on:

The WG hasn't completed it's discussion yet but the working proposal is:

http://lists.w3.org/Archives/Public/public-rdf-dawg/2012AprJun/0076.html
  and thread except that the word DATA will be VALUES.

Note the slight change in syntax to make the one variable/several 
variables cases a little clearer.

For the filter use cases, the setting of variables needs to move into a 
{} block for scoping reasons.

so:

SELECT *
{
      VALUES ?x { :x1 :x2 }
      ?x rdfs:label ?label .
}

SELECT *
WHERE {
     VALUES (?dayIDCheck ?dayName) {
     (0 "Sunday"@en)
     (1 "Monday"@en)
     (2 "Tuesday"@en)
     (3 "Wednesday"@en)
     (4 "Thursday"@en)
     (5 "Friday"@en)
     (6 "Saturday"@en)
     BIND (0 AS ?dayID)
     FILTER (?dayIDCheck = ?dayID)
}

Outstanding issues include exactly what happens to BINDINGS at the end 
of a query - one proposal to the group is to keep the concept (for the 
federated query use case) but adopt the same word/syntax as VALUES.

	Andy

On 02/05/12 10:49, Benjamin Nowack wrote:
> Hi,
>
> Just wanted to let you know that we (Kasabi/Talis) have a similar use
> case to [1] and would benefit from BINDINGS as a placeholder mechanism
> for parametrised queries,  la:
>
> [[[
> SELECT ?person WHERE {
> ?person ex:name ?name .
> FILTER(REGEX(?name, ?value))
> }
> BINDINGS ?value {('John')}
> ]]]
>
>
> (We don't need a formal response, just wanted to report the use case.)
>
> Cheers,
> Benji
>
> [1]
> http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/2012Mar/0018.html
>
>
Received on Wednesday, 2 May 2012 10:18:13 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Wednesday, 2 May 2012 10:18:13 GMT