prolog:meta_goal(+Goal, -Pattern)[multifile, dtd('tmp/src/swipl-8.1.1/build/home/library/prolog_xref')]
Define meta-predicates. See the examples in this file for details.
 prolog:meta_goal(+Goal, -Pattern)[multifile, library(prolog_xref)]
Define meta-predicates. See the examples in this file for details.