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 prolog:called_by(+Goal, +Module, +Context, -Called) is semidet[multifile, dtd('tmp/src/swipl-8.1.1/build/home/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.
 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.