A computer system uses a legal hierarchy annotated with seed citations to generate a control file, and then using the control file, permits legal documents to be classified automatically into the legal hierarchy without the need for manual intervention. Each classification within the legal hierarchy...http://www.google.com/patents/US5794236?utm_source=gb-gplus-sharePatent US5794236 - Computer-based system for classifying documents into a hierarchy and linking the classifications to the hierarchy 
