Synopses & Reviews
Synopsis
Excerpt from A Metadata Approach to Resolving Semantic Conflicts
With the development of complex information systems, the need for the integration of heterogeneous information systems, and the availability of numerous online computer data sources, it has become increasingly important that methods be developed that consider the meaning of the data used in these systems. For example, it is important that an application requiring financial data in French francs does not receive data from a source that reports in another currency. This problem is further complicated by the fact that the source meaning may change at any time; a source that once supplied financial data in French francs might decide to change to reporting that data in European Currency Units (ecus).
To deal with this problem, these systems must have the ability to represent data semantics and detect and automatically resolve conflicts in data semantics. At best, present systems permit an application to examine the data type definitions in the database schema, thus allowing for typechecking within the application. But this limited capability does not allow a system to represent and examine detailed data semantics nor handle changing semantics.
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