G. Sauter, Interoperabilität von Datenbanksystemen bei struktureller Heterogenität, Dissertation, Technische Universität Kaiserslautern, Dissertationen zu Datenbanken und Informationssystemen, Bd. 47, Infix, 1998.  Home/Search   Document Not in Database   Summary   Related Articles

....of the component information systems. Fig. 1: Mediator based Information Systems Nowadays different approaches exist to build the global schema of a mediator: Bottom up, a database integration method can be used to derive a federated schema from the component schemas (see for example [Schm 98] Sau 98] LNE 89] the structure of the federated schema will completely depend on the different component schemas. Top down, the mediator schema is built according to the information needs of the global information system using object oriented analysis and design methods as well as view integration ....

....compares the number of concepts used in the schemas. Implicit objects Whereas implicit properties can be made explicit within a correspondence assertion, implicit objects cannot be described. For that, we would need an operator to multiply objects of one schema as the UNNEST operator in [Sau 98] Different behaviour specifications Different behaviour specifications are not treated in MoCAs because operations should operate on local data. If operations should be considered, they can be handled like other properties: When a correspondence of operations is specified, the component ....

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G. Sauter, Interoperabilität von Datenbanksystemen bei struktureller Heterogenität, Dissertation, Technische Universität Kaiserslautern, Dissertationen zu Datenbanken und Informationssystemen, Bd. 47, Infix, 1998.

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