An exception indicating a problem when requesting a clause iterator, or when iterating clauses.
Introducing such an exception is necessary since clause sets may interface
with external systems (like relational databases or web services).
See Also:org.mandarax.kernel.ClauseSet See Also:org.mandarax.kernel.KnowledgeOwner See Also: org.mandarax.util.ClauseSetIterator author: Jens Dietrich version: 3.4 <7 March 05> since: 1.7