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Predicate rdf_resource/1
Availability::- use_module(library(semweb/rdf_db)).
Source[nondet]rdf_resource(?Resource)
True when Resource is a resource used as a subject or object in a triple.

This predicate is primarily intended as a way to process all resources without processing resources twice. The user must be aware that some of the returned resources may not appear in any visible triple.

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Wouter Beek said (2017-10-28T19:22:10):0 upvotes 0 0 downvotes
Picture of user Wouter Beek.
This predicate does not really enumerate RDF resources, which are the entities denoted by RDF terms. In terms of the RDF 1.1 standard, this predicate enumerates RDF nodes that are either blank nodes or IRIs. The predicates in library(semweb/rdf11) use terminology that is in line with the RDF 1.1 standard.