SWI-Prolog -- rdf_current

Documentation
- Reference manual
- Packages
  - SWI-Prolog Semantic Web Library 3.0
    - Two RDF APIs
      - library(semweb/rdf_db): The RDF database
        
        Prefix Handling
        
        rdf_current_prefix/2
        
        rdf_register_prefix/2
        
        rdf_register_prefix/3
        
        rdf_equal/2
        
        rdf_global_id/2
        
        rdf_global_object/2
        
        rdf_global_term/2

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

[nondet]rdf_current_prefix(:Alias, ?URI)

Query predefined prefixes and prefixes defined with rdf_register_prefix/2 and local prefixes defined with rdf_prefix/2. If Alias is unbound and one URI is the prefix of another, the longest is returned first. This allows turning a resource into a prefix/local couple using the simple enumeration below. See rdf_global_id/2.

rdf_current_prefix(Prefix, Expansion),
atom_concat(Expansion, Local, URI),