13. The method of claim 12, further comprising the step of: providing each one of the plurality of expressions with a predicate and at least one argument, wherein the predicate specifies relationships between the plurality of fields in the plurality of database tables.
13. The method of claim 12, further comprising the step of: providing each one of the plurality of expressions with a predicate and at least one argument, wherein the predicate specifies relationships between the plurality of fields in the plurality of database tables. 14. The method of claim 13, further comprising the step of: providing the at least one argument with any of a combination of explicit fields and implicit fields and a list of attributes that identify the predicate.