Excluding Blank Nodes from SPARQL query results

Question

I am using RDFLib to query on the Semantic Dicom Ontology. I am querying for owl:Class in the graph constructed from the above ontology. RDFLib returns results which contain bla

Answer 1

from rdflib import Graph
g = Graph()
g.parse('dicom.owl')
q = """SELECT ?c WHERE { ?c rdf:type owl:Class .
       FILTER (!isBlank(?c)) }"""
qres = g.query(q)

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Take a look at this family of SPARQL functions:

• isIRI,
• isBlank,
• isLiteral, isNumeric.