This part of IEC 61970 is a member of the Part 450 to 499 series that@ taken as a whole@ defines@ at an abstract level@ the content and exchange mechanisms used for data transmitted between control center components. Included in this part of IEC 61970 are the general use cases for exchange of graphic schematic display definitions@ and guidelines for linking the schematic definitions with CIM data. Guidelines for management of schematic definitions through multiple revisions are also included.