ok... after lots of experiment I finally got some that worked for my usecase.
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX annotea: <http://www.w3.org/2000/10/annotation-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT DISTINCT ?entry_uri WHERE { { ?annotation annotea:related ?entry_uri . ?annotation annotea:body ?term_uri . ?term_uri rdfs:label ?term.filter(?term = 'test2') } UNION { ?annotation annotea:related ?entry_uri . ?annotation annotea:body ?term_uri . ?term_uri rdfs:label ?term.filter(?term = 'test3') } } Note, three unions does not work(same pattern but with another term in the graph, 'term3'), which limit's the usefulness of this approach (but this seems to be reparable bug): return graph.query(q).serialize(format='python') File "/Users/whit/dev/tagger/src/rdflib.plug/rdflib/Graph.py", line 690, in query processed_query = processor.query(strOrQuery, initBindings, initNs, DEBUG, dataSetBase) File "/Users/whit/dev/tagger/src/rdflib.plug/rdflib/sparql/bison/Processor.py", line 39, in query return TopEvaluate(strOrQuery,self.graph,initBindings,DEBUG=DEBUG,dataSetBase=dataSetBase) File "/Users/whit/dev/tagger/src/rdflib.plug/rdflib/sparql/Algebra.py", line 341, in TopEvaluate topUnionBindings = result.parent1.top.returnResult(selectionF)+\ AttributeError: 'NoneType' object has no attribute 'returnResult' Though it works (or could for more than 2), it seems unwieldy since it requires replicating the entire query for each variation. But every case where two statements like so: WHERE { ?annotation annotea:related ?entry_uri . ?annotation annotea:body ?term_uri . ?term_uri rdfs:label ?term.filter(?term = 'test2') ?term_uri rdfs:label ?term.filter(?term = 'test3') } returned nothing (where ultimately there is a single entry_id that has both terms). It seems fundamentally limiting for sparql if this is the correct behavior (though http://www.w3.org/TR/rdf-sparql-query/ lists UNION as the way to do alternatives) sort of frustrating. in the old graphpattern way of querying, this was fairly easy to do and it's a fairly common querying usecase. Should we be able to do this with sparql? and if not, what are we suppose to use (and how do we get graphpattern and graph)? Is there a way to generate programmatic queries that makes more sense (currently I am generating strings and feed them to graph.query)? I've attached the rdf/xml of my data so others could look and see if I'm missing something. -w
<?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:annotea="http://www.w3.org/2000/10/annotation-ns#"; xmlns:foaf="http://xmlns.com/foaf/0.1/"; xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"; xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"; xmlns:tagger="http://xmlns.openplans.org/tagger#"; > <rdf:Description rdf:about="http://annotation.openplans.org/entry/urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6";> <annotea:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date";>2007-09-19 19:37:00.353979</annotea:created> <rdf:ID rdf:resource="urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6"/> <rdf:type rdf:resource="http://www.w3.org/2005/Atom/entry"/> </rdf:Description> <rdf:Description rdf:about="http://example.org/test3";> <rdfs:label>test3</rdfs:label> <tagger:hasScheme rdf:resource="http://example.org"/> <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/topic"/> </rdf:Description> <rdf:Description rdf:about="http://annotation.openplans.org/annotation/GiHeEEPV2";> <annotea:body rdf:resource="http://annotation.openplans.org/tag/test1"/> <annotea:annotates rdf:resource="http://example.org/ann-page.html"/> <rdf:type rdf:resource="http://www.w3.org/2000/10/annotation-ns#Annotation"/> <annotea:related rdf:resource="http://annotation.openplans.org/entry/urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6"/> <annotea:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date";>2007-09-19 19:37:00.353979</annotea:created> <annotea:author rdf:resource="http://example.org/test-user.html"/> </rdf:Description> <rdf:Description rdf:about="http://annotation.openplans.org/tag/test1";> <rdfs:label>test1</rdfs:label> <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/topic"/> </rdf:Description> <rdf:Description rdf:about="http://annotation.openplans.org/tag/test2";> <rdfs:label>test2</rdfs:label> <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/topic"/> </rdf:Description> <rdf:Description rdf:about="http://annotation.openplans.org/annotation/GiHeEEPV3";> <annotea:body rdf:resource="http://annotation.openplans.org/tag/test2"/> <annotea:annotates rdf:resource="http://example.org/ann-page.html"/> <rdf:type rdf:resource="http://www.w3.org/2000/10/annotation-ns#Annotation"/> <annotea:related rdf:resource="http://annotation.openplans.org/entry/urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6"/> <annotea:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date";>2007-09-19 19:37:00.353979</annotea:created> <annotea:author rdf:resource="http://example.org/test-user.html"/> </rdf:Description> <rdf:Description rdf:about="http://example.org/ann-page.html";> <rdf:type rdf:resource="http://www.w3.org/2005/Atom/link"/> </rdf:Description> <rdf:Description rdf:about="http://example.org/test-user.html";> <foaf:name>Test User</foaf:name> <foaf:mbox>[EMAIL PROTECTED]</foaf:mbox> <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/> </rdf:Description> <rdf:Description rdf:about="http://annotation.openplans.org/annotation/GiHeEEPV4";> <annotea:body rdf:resource="http://example.org/test3"/> <annotea:annotates rdf:resource="http://example.org/ann-page.html"/> <rdf:type rdf:resource="http://www.w3.org/2000/10/annotation-ns#Annotation"/> <annotea:related rdf:resource="http://annotation.openplans.org/entry/urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6"/> <annotea:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date";>2007-09-19 19:37:00.353979</annotea:created> <annotea:author rdf:resource="http://example.org/test-user.html"/> </rdf:Description> </rdf:RDF>
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