[redland-dev] [Rasqal RDF Query Library 0000400]: SPARQL query requires URIs with scheme component

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://bugs.librdf.org/mantis/view.php?id=400 
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Reported By:                dbrnz
Assigned To:                
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Project:                    Rasqal RDF Query Library
Issue ID:                   400
Category:                   query engine
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Query Language:             SPARQL 
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Date Submitted:             2010-11-29 04:00
Last Modified:              2010-11-29 04:00
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Summary:                    SPARQL query requires URIs with scheme component
Description: 
Even though URIs in the form <source> can be used to construct models, and those
statements found by using place-holders in a SPARQL query, they are not found by
a specific query giving the URI. URIs in the form
<http://www.example.org/ontology#source> work just fine. 








Steps to Reproduce: 
The following Python code illustrates the problem:

from RDF import *

par = NTriplesParser()
m = Model()
par.parse_string_into_model(m, """<http://www.ex.org/ont#source>
<http://www.ex.org/ont#p1> "44" .\n<s> <p> "v" .\n""", Uri('base'))

q = SPARQLQuery('select ?s ?p ?o  where { ?s ?p ?o }')
for a in m.execute(q): print a['s'], a['p'], a['o']
# Prints as expected:
#   <http://www.ex.org/ont#source> <http://www.ex.org/ont#p1> "44"
#   <s> <p> "v"

q = SPARQLQuery('select ?s  ?o  where { ?s <http://www.ex.org/ont#p1>  ?o }')
for a in m.execute(q): print a['s'],  a['o']
# Prints as expected:
#   <http://www.ex.org/ont#source> "44"

q = SPARQLQuery('select ?s  ?o  where { ?s <p>  ?o }')
for a in m.execute(q): print a['s'],  a['o']
# Nothing printed (expected <p> "v")

# Whereas:
for s in m.find_statements(Statement(None, Uri('p'), None)):
  print s.subject, s.object
# Prints as expected:
#   <p> "v"

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Issue History 
Date Modified    Username       Field                    Change               
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2010-11-29 04:00 dbrnz          New Issue                                    
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