A Tale of Two Schemas: Creating a Temporal XML Schema from a Snapshot Schema with £nXSchema Faiz Currim, Sabah Currim, Curtis Dyreson, and Richard T. Snodgrass   View Paper (PDF)   Return to Session 6: Innovative Modeling Concepts for Spatial and Temporal Databases Abstract #964;XSchema, for creating a temporal schema from a non-temporal (snapshot) schema, a temporal annotation, and a physical annotation. The annotations specify which portion(s) of an XML document can vary over time, how the document can change, and where timestamps should be placed. The advantage of using annotations to denote the time-varying aspects is that logical and physical data independence for temporal schemas can be achieved while remaining fully compatible with both existing XML Schema documents and the XML Schema recommendation. ©2005 Association for Computing Machinery