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Pack xlibrary -- prolog/compound_expand.pl
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 before(+Module) is det
Declaration to say that the expansion provided by this Module must happen before the expansion in Module
 after(+Module) is det
Declaration to say that the expansion provided by this Module must happen after the expansion in Module
 init_expansors is det
Declaration to say that the compound expansion definition has finish and now the expansions can begin. This is required to speed up the compilation, since the predicate collect_expansors/3 is expensive but its solution doesn't change once no more expansors are added.