Proceedings of the 13th International Conference on Data
Engineering,
(April 1997), pp 55-65.
The need to transform data between heterogeneous databases arises from a number of critical tasks in data management. These problems are further complicated by schema evolution in the underlying databases, and by the presence of non-standard database constraints. We describe a declarative language, WOL, for specifying such transformations, and an implementation, Morphase, based on this language. WOL is designed to allow transformations between the complex data structures which arise in object-oriented databases, as well as complex relational databases, and to allow for reasoning about the interactions between database transformations and constraints.
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