Source: rasqal
Version: 1.0.10-3
Please consider the following RDF graph representations:
$ rdfproc -s sqlite +sparql-2010-10-25.sqlite \
serialize ntriples
<uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#subject>
<uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#predicate>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean> .
$ rdfproc -s sqlite +sparql-2010-10-25.sqlite.~5~ \
serialize ntriples
<uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#subject>
<uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#predicate>
"1"^^<http://www.w3.org/2001/XMLSchema#boolean> .
$
Following [1, 2], my understanding is that these are
representations of essentially the same graph. Thus, I'd expect
that the following SPARQL query to produce identical results for
both of the storages, contrary to what actually happens:
$ rdfproc -s sqlite +sparql-2010-10-25.sqlite \
query sparql - 'SELECT ?s ?p WHERE { ?s ?p true . }'
rdfproc: Query returned bindings results:
result: [s=[uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#subject],
p=[uuid:d9054928-e048-11df-a0c0-4040a5e6bfa3#predicate]]
rdfproc: Query returned 1 results
$ rdfproc -s sqlite +sparql-2010-10-25.sqlite.~5~ \
query sparql - 'SELECT ?s ?p WHERE { ?s ?p true . }'
rdfproc: Query returned bindings results:
rdfproc: Query returned 0 results
$
[1] http://www.w3.org/TR/xmlschema11-2/#boolean
[2] http://www.w3.org/TR/xmlschema11-2/#f-booleanLexmap
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