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dialect.pl -- Support multiple Prolog dialects
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The idea for this predicate was raised by Vitor Santos Costa in a discussion to reach as a portability framework between SWI-Prolog and YAP.

This library defines :- expects_dialect/1, telling the system for which Prolog dialect was written, as well as useful tests in conditional compilation:

- Jan Wielemaker
- Vitor Santos Costa
See also
- if/1, require/1, term_expansion/2, goal_expansion/2.
Source expects_dialect(+Dialect:atom) is det
Tell Prolog all subsequent code to the end of the file or the next :- expects_dialect/1 directive is written for the indicated Dialect. The current dialect is available through prolog_load_context/2.
To be done
- Should we setup the dialect module only as autoload for the current module?
Source source_exports(+Source, +Export) is semidet
source_exports(+Source, -Export) is nondet
True if Source exports Export. Fails without error if this is not the case. See also exists_source/1.
To be done
- Should we also allow for source_exports(-Source, +Export)?
Source open_source(+Source, -In:stream) is semidet[private]
Open a source location.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

Source exists_source(Arg1)