rdf_is_subject/1

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Predicate rdf_is_subject/1

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Availability::- use_module(library(semweb/rdf11)).

Source

[semidet]rdf_is_subject(@Term)

True if Term can appear in the subject position of a triple.

Only blank nodes and IRIs can appear in the subject position.

Success of this goal does not imply that the subject term is present in the database (see rdf_subject/1 for that).

Since blank nodes are represented by atoms that start with‘_:` and an IRIs are atoms as well, this is equivalent to atom(Term).