Content Schema Evolution in the CoreMedia®; Content Application Platform CAP

Based on experience gathered with several releases of the CoreMedia Content Application Platform (CAP), we argue that a modern, generalized Content Management System should, as database systems do, support explicit content schemata. To control the inevitable evolution of the content schema, the schema should be subject to configuration management together with the actual content. We propose a two-layered approach to content schema evolution consisting of – a system level responsible for bookkeeping and integrity issue detection, and – a semi-automatic application level responsible for resolving schemarelated issues. A prototype using the proposed approach has been successfully implemented at CoreMedia.