SWI-Prolog -- lang

Documentation
- Reference manual
- Packages
  - SWI-Prolog Semantic Web Library 3.0
    - Two RDF APIs
      - library(semweb/rdf_db): The RDF database
        
        Miscellaneous predicates
        
        rdf_bnode/1
        
        rdf_source_location/2
        
        rdf_generation/1
        
        rdf_estimate_complexity/4
        
        rdf_statistics/1
        
        rdf_match_label/3
        
        lang_matches/2
        
        lang_equal/2
        
        rdf_reset_db/0
        
        rdf_version/1

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

[semidet]lang_matches(+Lang, +Pattern)

True if Lang matches Pattern. This implements XML language matching conform RFC 4647. Both Lang and Pattern are dash-separated strings of identifiers or (for Pattern) the wildcart *. Identifiers are matched case-insensitive and a * matches any number of identifiers. A short pattern is the same as *.