Schema Versioning in Multi-temporal XML Databases

Schema evolution keeps only the current data and the schema version after applying schema changes. On the contrary, schema versioning creates new schema versions and preserves old schema versions and their corresponding data. Much research work has recently focused on the problem of schema evolution in XML databases, but less attention has been devoted to schema versioning in such databases. In this paper, we present an approach for schema versioning in multitemporal XML databases. This approach is based on the XML Schema language for describing XML schema, and is database consistency-preserving.