12. The method of claim 9 wherein said generating a query comprises specifying at least one condition that must be satisfied by at least one value of a property or composition of properties defined on the at least one subject class.
12. The method of claim 9 wherein said generating a query comprises specifying at least one condition that must be satisfied by at least one value of a property or composition of properties defined on the at least one subject class. 13. The method of claim 12 wherein the property or composition of properties defined on the at least one subject class, is inherited from a property or composition of properties defined on a superclass of the subject class.