prolog:called_by(+Goal, +Module, +Context, -Called) is semidet[multifile, '/home/swipl/src/swipl-devel/build/home/library/prolog_xref.pl']
True when Called is a list of callable terms called from Goal, handled by the predicate Module:Goal and executed in the context of the module Context. Elements of Called may be qualified. If not, they are called in the context of the module Context.
 prolog:called_by(+Goal, +Module, +Context, -Called) is semidet[multifile, library(prolog_xref)]
True when Called is a list of callable terms called from Goal, handled by the predicate Module:Goal and executed in the context of the module Context. Elements of Called may be qualified. If not, they are called in the context of the module Context.