SWI-Prolog -- non

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Predicate non_terminal/1

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  - Built-in Predicates
    - Declaring predicate properties
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Availability:built-in

non_terminal :PredicateIndicator, ...

Sets the non_terminal property on the predicate. This indicates that the predicate implements a grammar rule. See predicate_property/2. The non_terminal property is set for predicates exported as Name//Arity as well as predicates that have at least one clause written using the -->/2 notation.