dbcls/LinkedData-Agora

Labels for metadata are only counted if in the same graph as the data.

Opened this issue · 2 comments

JervenBolleman commented

e.g. yummydata uses this query on UniProt to detect "No labels of classes found on graph ."

SELECT DISTINCT ?c ?label WHERE { GRAPH <http://sparql.uniprot.org/citationmapping> { ?c <http://www.w3.org/2000/01/rdf-schema#label> ?label . VALUES (?c) { ( <http://www.w3.org/2002/07/owl#Ontology> ) ( <http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement> ) ( <http://purl.uniprot.org/core/Annotation> ) ( <http://purl.uniprot.org/core/Citation_Statement> ) } } }

which validly has no results.
while

SELECT DISTINCT ?c ?label WHERE { ?c <http://www.w3.org/2000/01/rdf-schema#label> ?label . VALUES (?c) { ( <http://www.w3.org/2002/07/owl#Ontology> ) ( <http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement> ) ( <http://purl.uniprot.org/core/Annotation> ) ( <http://purl.uniprot.org/core/Citation_Statement> ) } }

does.

Would you consider making this measurement more flexible?

yayamamo commented

Thanks for your comment.
I'm afraid that it takes a lot to get a result or even time-out happens at some endpoints without specifying a graph.
I'd be glad if you could have a better idea.

JervenBolleman commented

Maybe list the values after the basic graph pattern and add a limit?

SELECT ?c ?label 
WHERE {  
  VALUES (?c) { ( <http://www.w3.org/2002/07/owl#Ontology> ) ( <http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement> ) ( <http://purl.uniprot.org/core/Annotation> ) ( <http://purl.uniprot.org/core/Citation_Statement> ) } 
?c <http://www.w3.org/2000/01/rdf-schema#label> ?label . 
} LIMIT 2000
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