3. The computer readable media of claim 2 , the method further comprising normalizing said multi-dimensional vectors.
3. The computer readable media of claim 2 , the method further comprising normalizing said multi-dimensional vectors. 4. The computer readable media of claim 3 , the method further comprising identifying at least one query predicate structure by a second predicate key that is a second integer representation, and constructing second multi-dimensional vectors, for said at least one query predicate structure, using said second integer representation.