An approach to CAD database support of design consistency control

CAD database services which support CAD tools in preserving design consistency are presented. Design consistency is briefly defined. Interactive design tools require support with respect to the specification of consistency rules, check points, and reactions to checks. Services of the object oriented IREEN database system designed to meet these requirements are presented. The authors introduce tasks (event driven processes) which provide a means to create supervisors for consistency rules as well as to model higher order actions to which consistency rules are related