Abstract super class providing some common functionality
for classes implementing org.mandarax.kernel.Clause.
author: Jens Dietrich version: 3.4 <7 March 05> since: 1.0
Get the clause set containing the clause. This method is in particular useful for analyzing derivations,
since derivations show only the clauses used, not the clause set generating this clauses (e.g., AutoFacts). On the other
hand, knowledge bases contain often clause sets. So it could be hard to find the clause sets in the knowledge base
that caused a certain result. For sme clauses such as facts, the container is just the fact itself.
a clause set