[#SES-952] SPARQL 1.1 BINDINGS clause + CONSTRUCT: BINDINGS are ignored.

Issue Details [XML]

Key:	SES-952
Type:	Bug
Status:	Resolved
Resolution:	Fixed
Priority:	Major
Assignee:	Jeen Broekstra
Reporter:	Josh Mandel
Votes:	0
Watchers:	0

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SPARQL 1.1 BINDINGS clause + CONSTRUCT: BINDINGS are ignored.

Created: 06/Mar/12 11:11 PM Updated: 07/Mar/12 05:52 AM

Component/s:

SPARQL

Affects Version/s:

2.6.2, 2.6.3

Fix Version/s:

2.6.4

Environment:

System Version: Mac OS X 10.6.8 (10K549)
Kernel Version: Darwin 10.8.0
Boot Volume: Macintosh HD

Issue Links:

Related

This issue is related to:
	~~SES-920~~ SPARQL 1.1 BINDINGS clause + ASK - al...

Description

I tried the example from http://www.w3.org/TR/sparql11-query/#bindings
with the BINDINGS clause. Thus I added the triples into a Native Java store RDF schema:

=====
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix : <http://example.org/book/> .
@prefix ns: <http://example.org/ns#> .

:book1 dc:title "SPARQL Tutorial" .
:book1 ns:price 42 .
:book2 dc:title "The Semantic Web" .
:book2 ns:price 23 .
=====

and I tried the query:

=====
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://example.org/book/>
PREFIX ns: <http://example.org/ns#>

SELECT ?book ?title ?price
{
   ?book dc:title ?title ;
         ns:price ?price .
}
BINDINGS ?book {
(:book1)
}
======

the result is, as expected, the same result reported at http://www.w3.org/TR/sparql11-query/#bindings

The problem arises when I use an ASK instead of a SELECT clause.
If I try with

=====
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://example.org/book/>
PREFIX ns: <http://example.org/ns#>

ASK
{
   ?book dc:title ?title ;
         ns:price ?price .
}
BINDINGS ?book {
(:book1)
}
=====

the answer is TRUE (as expected), but if I try with

=====
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://example.org/book/>
PREFIX ns: <http://example.org/ns#>

ASK
{
   ?book dc:title ?title ;
         ns:price ?price .
}
BINDINGS ?book {
(:book5)
}
=====

the answer is TRUE again (and :book5 does not exist).
In fact, if I try with the same ASK but without using the BINDINGS clause like in

=====
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://example.org/book/>
PREFIX ns: <http://example.org/ns#>

ASK
{
   :book5 dc:title ?title ;
         ns:price ?price .
}
=====

the answer is FALSE, as expected.
The BINDINGS clause coupled with the SELECT clause works also in the case of book5, like in
the query

=====
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://example.org/book/>
PREFIX ns: <http://example.org/ns#>

SELECT ?book ?title ?price
{
   ?book dc:title ?title ;
         ns:price ?price .
}
BINDINGS ?book {
(:book5)
}
====

where I get no results, as expected.

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Comment by Jeen Broekstra [07/Mar/12 05:52 AM]

This issue is caused by the same problem that caused errors in ASK queries.