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This section describes directives which manipulate attributes of predicate definitions. The functors dynamic/1, multifile/1, discontiguous/1 and public/1 are operators of priority 1150 (see op/3), which implies that the list of predicates they involve can just be a comma-separated list:
:- dynamic foo/0, baz/2.
In SWI-Prolog all these directives are just predicates. This implies they can also be called by a program. Do not rely on this feature if you want to maintain portability to other Prolog implementations.