rdf11:rdf_length/2

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Predicate rdf_length/2

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semweb
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rdf_length(+RDFList, -Length:nonneg) is nondet: True when Length is the number of cells in RDFList. Note that a list cell may have multiple rdf:rest triples, which makes this predicate non-deterministic. This predicate does not check whether the list cells have associated values (rdf:first). The list must end in rdf:nil.