Re: can/should a parser join groups? from Ruben Verborgh on 2014-08-20 (public-sparql-dev@w3.org from July to September 2014)

From: Ruben Verborgh <ruben.verborgh@ugent.be>
Date: Wed, 20 Aug 2014 23:44:47 +0200
To: Andy Seaborne <andy@apache.org>
Cc: public-sparql-dev@w3.org
Message-Id: <6DFDFCE5-D5B8-482B-B3FC-76392CD43C6F@ugent.be>

Hi Andy,

>> Is it a good idea for a parser to do this in general?
> 
> Probably!

One exception I noted:

SELECT  ?title ?price
{  ?x ns:price ?p .
   ?x ns:discount ?discount
   BIND (?p*(1-?discount) AS ?price)
   FILTER(?price < 20)
   ?x dc:title ?title . 
}

According to the spec,
“BIND ends the basic graph pattern” [1],
so here we probably don't want to bring the BGPs together?

Are there any other cases like this?

Thanks,

Ruben

[1] http://www.w3.org/TR/sparql11-query/#assignment

Received on Wednesday, 20 August 2014 21:45:23 UTC