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Rewriter for Propagation of Ground Terms in Rule Graph

 

The constants in the rule graph can be propagated and thus sometimes edges may be deleted.

Example

p("b","X") :- q("X").

t("X","Y") :- p("X","Y").

?- t("a","X").

If there are only facts for q this query cannot deliver an answer. This may already be seen in the rule graph by propagating the constant a to the second rule and then to the third rule.