def setup_concept_scheme(rdf, defaultcs):
for conc in rdf.subjects(RDF.type, SKOS.Concept):<EOL><INDENT>cs = rdf.value(conc, SKOS.inScheme, None, any=True)<EOL>if cs is None:  <EOL><INDENT>rdf.add((conc, SKOS.inScheme, defaultcs))<EOL><DEDENT><DEDENT>
Make sure all concepts have an inScheme property, using the given
    default concept scheme if necessary.