SWI-Prolog -- asserta/2

Documentation
- Reference manual
  - Built-in Predicates
    - Database
      - Managing (dynamic) predicates
        
        abolish/1
        
        abolish/2
        
        copy_predicate_clauses/2
        
        redefine_system_predicate/1
        
        retract/1
        
        retractall/1
        
        asserta/1
        
        assertz/1
        
        assert/1
        
        asserta/2
        
        assertz/2
        
        assert/2
- Packages

Availability:built-in

asserta(+Term, -Reference)

Asserts a clause as asserta/1 and unifies Reference with a handle to this clause. The handle can be used to access this specific clause using clause/3 and erase/1.