rdf_length/2

Documentation
- Reference manual
- Packages
  - SWI-Prolog Semantic Web Library 3.0
    - Two RDF APIs
      - library(semweb/rdf11): The RDF database
        
        Accessing RDF collections
        
        rdf_last/2
        
        rdf_list/1
        
        rdf_list/2
        
        rdf_length/2
        
        rdf_member/2
        
        rdf_nth0/3
        
        rdf_nth1/3
        
        rdf_assert_list/2
        
        rdf_assert_list/3
        
        rdf_retract_list/1

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

Source

[nondet]rdf_length(+RDFList, -Length:nonneg)

True when Length is the number of cells in RDFList. Note that a list cell may have multiple rdf:rest triples, which makes this predicate non-deterministic. This predicate does not check whether the list cells have associated values (rdf:first). The list must end in rdf:nil.