Your mediators need data conversion!
Sophie Cluet, Claude Delobel, Jérǒme Simèon, Katarzyna Smaga · 1998
Due to the development of the World Wide Web, the integration of heterogeneous data sources has become a major concern of the database community. Appropriate architectures and query languages have been proposed. Yet, the problem of data conversion which is essential for the development of mediators/wrappers architectures has remained largely unexplored.