Michael Stahl wrote:
it seems that if i write a triple with 3 uris like this:
<uri:foo> <uri:bar> <uri:baz>.
in a SPARQL query, it will return no results, even if such a triple is
in the graph.
pResults: 29a98; not finished
count: 4
pResults: 29af8; not finished
count: 2
pResults: 299d8; not finished
count: 2
pResults: 29ad8; not finished
count: 2
librdf warning URI file:///home/ms216673/rdf/:1 - Variable s was
selected but is unused in the query.
librdf warning URI file:///home/ms216673/rdf/:1 - Variable p was
selected but is unused in the query.
librdf warning URI file:///home/ms216673/rdf/:1 - Variable o was
selected but is unused in the query.
pResults: 29b28; is finished
count: 0
pResults: 29bc8; is finished
count: 0
see attached program: queries 1-4 seem to work
query 5 returns no result, but should return one result with nulls
query 6 returns no result, but should return 2 results.
Those are rather wierd queries in that the first one binds no variables
and both have constant triple patterns. So the query engine has a bug
in this area but it's probably not been sene before
here is the output of the same queries with Sesame 2.0:
SELECT ?s ?p ?o FROM <uri:context> WHERE { ?foo ?bar ?baz . ?s ?p ?o. }
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
end results.
SELECT ?s ?p ?o FROM <uri:context> WHERE { <uri:foo> ?bar ?baz . ?s ?p
?o. }
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
end results.
SELECT ?s ?p ?o FROM <uri:context> WHERE { <uri:foo> <uri:bar> ?baz . ?s
?p ?o. }
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
end results.
SELECT ?s ?p ?o FROM <uri:context> WHERE { <uri:foo> ?bar <uri:baz> . ?s
?p ?o. }
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
end results.
SELECT ?s ?p ?o FROM <uri:context> WHERE { <uri:foo> <uri:bar> <uri:baz>. }
result: <null> <null> <null>
end results.
SELECT ?s ?p ?o FROM <uri:context> WHERE { <uri:foo> <uri:bar>
<uri:baz>. ?s ?p ?o. }
result: uri:baz uri:foo uri:bar
result: uri:bar uri:baz uri:foo
end results.
oh, and serializing the result of a query does not seem to work either
(see FIXME in attached file).
Looks like you are using an old URI for the XML result format, I changed it
to
unsigned char SXML[]
= "http://www.w3.org/TR/2006/WD-rdf-sparql-XMLres-20070614/";;
and I get sparql xml results out (this depends on the version of rasqal).
It might be the documentation is giving the wrong url somewhere.
Dave
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