[redland-dev] [Rasqal RDF Query Library 0000305]: bound gives incoherent results

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://bugs.librdf.org/mantis/view.php?id=305 
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Reported By:                mainka
Assigned To:                
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Project:                    Rasqal RDF Query Library
Issue ID:                   305
Category:                   query engine
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Query Language:             sparql 
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Date Submitted:             2009-05-13 18:22
Last Modified:              2009-05-13 18:22
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Summary:                    bound gives incoherent results
Description: 
graph :
@prefix foaf:        <http://xmlns.com/foaf/0.1/> .
@prefix dc:          <http://purl.org/dc/elements/1.1/> .
@prefix xsd:          <http://www.w3.org/2001/XMLSchema#> .

_:a  foaf:givenName  "Alice".

_:b  foaf:givenName  "Bob" .
_:b  dc:date         "2005-04-04T04:04:04Z"^^xsd:dateTime .

query 1:
roqet: Running query 'PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc:   <http://purl.org/dc/elements/1.1/>
PREFIX xsd:   <http://www.w3.org/2001/XMLSchema#>
SELECT ?name
 WHERE { ?x foaf:givenName  ?name .
         OPTIONAL { ?x dc:date ?date } .
         FILTER ( !bound(?date) ) }'
roqet: Query has a variable bindings result
result: [name=string("Alice")]
roqet: Query returned 1 results

As expected...

But :

query 2:
roqet: Running query 'PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc:   <http://purl.org/dc/elements/1.1/>
PREFIX xsd:   <http://www.w3.org/2001/XMLSchema#>
SELECT ?name
 WHERE { ?x foaf:givenName  ?name .
         OPTIONAL { ?x dc:date ?date } .
         FILTER ( bound(?date) ) }'
roqet: Query has a variable bindings result
roqet: Query returned 0 results

Shouldn't it return "Bob"?

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Issue History 
Date Modified    Username       Field                    Change               
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2009-05-13 18:22 mainka         New Issue                                    
2009-05-13 18:22 mainka         Query Language            => sparql          
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