On 8/1/17 2:07 PM, Paul Houle wrote:
> Hello, I am having trouble doing queries with named graphs on the
> dbpedia public SPARQL endpoint. I can see a large number of graphs
> if I write
>
> SELECT DISTINCT ?g { GRAPH ?g {?s ?p ?o .}}
>
> ---
>
> g
> http://www.openlinksw.com/schemas/virtrdf#
> http://www.w3.org/ns/ldp#
> http://dbpedia.org/sparql
> http://dbpedia.org/DAV/
> http://www.w3.org/2002/07/owl#
> file:wikidata_to_schema_mappings.ttl
> http://dbpedia.org/schema/property_rules#
> dbprdf-label
> http://dbpedia.org/resource/classes#
> http://www.ontologyportal.org/SUMO#
> http://www.ontologyportal.org/WordNet#
> b3sonto
> b3sifp
> urn:rules.skos
> http://www.openlinksw.com/schemas/oplweb#
> virtrdf-label
> facets
> urn:virtuoso:val:acl:schema
> http://www.openlinksw.com/virtpivot/icons
> http://www.openlinksw.com/schemas/virtpivot
> virtpivot-rules
> http://www.openlinksw.com/schemas/virtcxml#
> virtpivot-icon-test
> http://pivot_test_data/campsites
> http://pivot_test_data/ski_resorts
> http://www.wikidata.org
> https://github.com/structureddynamics/UMBEL/External%20Ontologies/dbpedia-ontology.n3
>
> http://dbpedia.org
> http://people.aifb.kit.edu/ath/#DBpedia_PageRank
> http://dbpedia.org/page_links
> http://dbpedia.org/void/
> http://dbpedia.org/virt_curi
>
>
>
>
> If I try to look at a typical graph, say
>
> SELECT (COUNT(*) AS ?cnt) {GRAPH
> {?s ?p ?o .}}
>
> Virtuoso 37000 Error SP031: SPARQL compiler: No one quad map pattern is
> suitable for GRAPH { ?s ?p ?o } triple
> at line 3
> I took a look at
> https://github.com/openlink/virtuoso-opensource/blob/64e20840b0db753d58f9f679eaefa1ad1e5b73fe/libsrc/Wi/sparql2sql.c#L5019
> and it still is not clear to me what is going on. Any ideas?
Paul,
Lookup:
http://dbpedia.org/sparql?default-graph-uri=&query=%0D%0ASELECT+%28COUNT%28*%29+AS+%3Fcnt%29+%7BGRAPH+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2Fclasses%23%3E+%7B%3Fs+%3Fp+%3Fo+.%7D%7D&format=text%2Fhtml&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=3&debug=on
Source:
http://dbpedia.org/sparql?default-graph-uri=&qtxt=%0D%0ASELECT+%28COUNT%28*%29+AS+%3Fcnt%29+%7BGRAPH+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2Fclasses%23%3E+%7B%3Fs+%3Fp+%3Fo+.%7D%7D&format=text%2Fhtml&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=3&debug=on
Issue:
UI quirk whereby is set as the default named graph.
Just remove that and the issue goes away.
Kingsley
>
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