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Predicate rdf_current_literal/1
Availability::- use_module(library(semweb/rdf_db)).
Source[nondet]rdf_current_literal(-Literal)
True when Literal is a currently known literal. Enumerates each unique literal exactly once. Note that it is possible that the literal only appears in already deleted triples. Deleted triples may be locked due to active queries, transactions or snapshots or may not yet be reclaimed by the garbage collector.
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Wouter Beek said (2017-10-28T20:23:31):0 upvotes 0 0 downvotes
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Notice that Literal does not include the outer literal/1 predicate. This means that instantiations of Literal cannot be used directly in other rdf_db predicates.

Literal can have either of the following forms:

  1. type(DatatypeIri,LexicalExpression) for typed literals
  2. lang(LanguageTag,LexicalExpression) for language-tagged strings
  3. LexicalExpression for plain strings

The predicate rdf_literal/1 in library(semweb/rdf11) does bind Literal to full literal terms.