rdf_db:rdf_update/4

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Predicate rdf_update/4

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semweb
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rdf_update(+Subject, +Predicate, +Object, ++Action) is det

rdf_update(+Subject, +Predicate, +Object, +Graph, ++Action) is det

Replaces one of the three (four) fields on the matching triples depending on Action:

subject(Resource): Changes the first field of the triple.
predicate(Resource): Changes the second field of the triple.
object(Object): Changes the last field of the triple to the given resource or literal(Value).
graph(Graph): Moves the triple from its current named graph to Graph. This only works with rdf_update/5 and throws an error when used with rdf_update/4.