An improved command handler (and database system utilizing the improved command handler) interfaces to a datastore storing item data for a plurality of items and bi-directional modifier data, corresponding to a relation between at least one first item and at least one second item, that represents first...http://www.google.de/patents/US6618732?utm_source=gb-gplus-sharePatent US6618732 - Database query handler supporting querying of textual annotations of relations between data objects
