4.9.2 Associating Predicates with their Properties

The following properties are associated with predicates either implicitly or by declaration:

built_in

The predicate is built-in.

compiled

The predicate is in virtual code representation.

interpreted

The predicate is in interpreted representation.

fd_constraint

The predicate is a so-called FD predicate; see Defining Primitive Constraints.

dynamic

The predicate was declared dynamic.

volatile

The predicate was declared volatile.

multifile

The predicate was declared multifile.

block(SkeletalGoal)

The predicate has block declarations.

meta_predicate(SkeletalGoal)

The predicate is a meta-predicate.

As of release 4.2, the SkeletalGoal will contain the specifications used in the original meta-predicate declaration.

exported

The predicate was exported from a module.

imported_from(Module)

The predicate was imported from the module Module.

Every predicate has exactly one of the properties [built_in, compiled, interpreted, fd_constraint], at most one of the properties

[exported, imported_from(SkeletalGoal)], zero or more block(SkeletalGoal) properties, and at most one of the remaining properties.

To query these associations, use predicate_property/2. The reference page contains several examples. See mpg-ref-predicate_property.