Jan Burse, created Jul 15. 2019
* This module provides directives for notebooks. Notebooks are
* Prolog modules that have a secondary purpose than only being
* consulted. The secondary purpose is that they are to contain
* query which are automatically displayed to the end-user and which
* can be modified by the end-user.
* Without specifying how the displaying or the modification is
* performed we provide directives to embed queries inside Prolog
* modules. The idea is that normal ISO comments are the text cells
* of a notebook, that normal ISO clauses/directives are the program
* cells of a notbook and that a new directive marks queries.
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* The predicate succeeds in setting this module to notebook.
* The predicate succeeds in B with the call parent of the current clause.
sys_parent_goal/1, 'SpecialDirectives', 0).
* ?- G:
* The directive succeeds always. Whenever the goal G succeeds,
* the directive will show the solution. When the goal G fails,
* the directive will show an internationalized no.
sys_show_name_or_eq_list(R, M), nl.
( E ==