SWI-Prolog -- elif/1

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Predicate elif/1

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Documentation
- Reference manual
  - Built-in Predicates
    - Loading Prolog source files
      - Conditional compilation and program transformation
        
        Conditional compilation
        
        if/1
        
        elif/1
        
        else/0
        
        endif/0
- Packages

:- elif(:Goal)

Equivalent to :- else. :-if(Goal). ... :- endif. In a sequence as below, the section below the first matching elif is processed. If no test succeeds, the else branch is processed.

:- if(test1).
section_1.
:- elif(test2).
section_2.
:- elif(test3).
section_3.
:- else.
section_else.
:- endif.