Why bother storing WORDS scripts inside Topics?
They effectively configure CONTEXT on a type-by-type basis, to handle constraints, defaults and data inheritance. This is where the PSIs come into play. By citing them appropriately inside ontology-level topics (types of rolespecs, associations, occurrences, names), an author can script the whole topic map into a self-consistent mini-application, portable via XTM to other MODELER users.
