Abstract
Viewm echanisms play an important role in restructuring data for users, while maintaining the integrity and autonomy for the underlying database schema. Although far more complex than their relational counterparts, numerous object-oriented viewm echanisms have been specified and implemented over the last decade. These viewmec hanisms have served different functions: viewsc hemata for object-oriented databases; object views of relational (and other) database systems, and the formation of federated schemata for distributed information systems. In the latter category there is still a significant amount of research required to construct a viewl anguage powerful enough to support federated views. Such a language (or set of languages) should support not only object views, but also a wrapper specification language for external information sources, and a set of restructuring and integration operators. Furthermore, with the advent of standard models and technologies such as CORBA for distribution, ODMG for storage, and XML for web publishing, these languages should be based upon, or cooperate with, these standards. In this research, we present a view mechanism which retains the semantic information incorporated in ODMG schemata, provide a set of operators which facilitate the restructuring and integration necessary to merge schemata, and provide wrappers to heterogenous systems such as legacy systems, ODBC databases, and XML data sources.
Supported by Forbairt Strategic Research Programme ST/98/014
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Roantree, M., Kennedy, J.B., Barclay, P.J. (2001). Integrating View Schemata Using an Extended Object Definition Language. In: Batini, C., Giunchiglia, F., Giorgini, P., Mecella, M. (eds) Cooperative Information Systems. CoopIS 2001. Lecture Notes in Computer Science, vol 2172. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44751-2_13
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