Interface representing queries. Queries consist of one or many facts and a common name.
The inference engine then tries to replace the variables in these facts by constants, using
the knowledge in a knowledge base.
DerivationEventListeners can be attached to a query. If the IE supports them (use the feature descriptor
of the IE to find out) the respective callback will be called by the IE.
See Also:org.mandarax.kernel.Fact See Also:org.mandarax.kernel.LogicFactory See Also:org.mandarax.kernel.DerivationEventListener author: Jens Dietrich version: 3.4 <7 March 05> since: 1.9