12. A system according to claim 11 , wherein the electronically-stored rules set further identify soft constraints are defined to include permissive rules, and those topic models that violate one or more of the permissive rules are discounted.
12. A system according to claim 11 , wherein the electronically-stored rules set further identify soft constraints are defined to include permissive rules, and those topic models that violate one or more of the permissive rules are discounted. 13. A system according to claim 12 , wherein the permissive rules comprise one or more of: one such topic model that includes no term from the label for the topic to which the topic model belongs that is not duplicated in any other label within the topic tree; one such topic model that includes no non-duplicated term from the label of a parent topic for the topic to which the topic model belongs when the label is duplicated in another label within the topic tree; and one such topic model that includes a term from a label of a common ancestor topic for the topic to which the topic model belongs when the label is duplicated in another label within the topic tree.