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4.12.5 Removing Clauses from the Database

This section briefly describes the predicates used to remove the clauses and/or properties of a predicate from the system.

Please note: Removing all of a predicate’s clauses by retract/1 and/or erase/1 (see ref-mdb-rcd-efu) does not remove the predicate’s properties (and hence its definition) from the system. The only way to completely remove a predicate’s clauses and properties is to use abolish/[1,2].


erase the first dynamic clause that matches C


erase every clause whose head matches H


abolish the predicate(s) specified by F


abolish the predicate(s) specified by F with options O


erase the clause or recorded term (see ref-mdb-idb) with reference R

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