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Many RDF stores turned triples into quadruples. This store is no exception, initially using the 4th argument to store the filename from which the triple was loaded. Currently, the 4th argument is the RDF named graph. A named graph maintains some properties, notably to track origin, changes and modified state.
Additional graph properties can be added by defining rules for the multifile predicate property_of_graph/2. Currently, the following extensions are defined:
trueif the graph is persistent.