Jan Burse, created Aug 17. 2019
* We provide a couple of additional variables predicates. Prolog already
* provides an existential quantification operator in the form of (^)/2.
* This operator is only needed in certain circumstance such as the
* frequent predicates from the module abstract or the module bags.
* ?- sys_term_kernel(X#p(X,Y),K).
* K = p(X,Y)
* ?- sys_term_globals(X#p(X,Y),L).
* L = [Y]
* We introduce a further operator. We use the form (#)/2 for the
* universal quantification opera-tor. For performance reasons we
* have introduced the predicates sys_term_kernel/2 and sys_term_globals/2
* which are the analogues to the corresponding goal predicates.
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* sys_term_kernel(G, K):
* The predicate succeeds when K unifies with the kernel of the goal G.
sys_term_kernel/2, 'SpecialStruc', 0).
* sys_term_globals(G, L):
* The predicate succeeds when L unifies with the global variables of the goal G.
sys_term_globals/2, 'SpecialStruc', 1).