Semantic Schema Integration in a Heterogeneous Database Environment

One of the most common approaches for accessing heterogeneous information systems is based on constructing a global schema describing the information in the individual databases. In order to automatically build such a schema, we need to formally represent the database schemata populating the component information systems and their interrelationships. Towards this aim, we use a logic language to express interdependencies between classes belonging to different schemata. Such interdependencies allow a designer of a cooperative information system to establish several relationships between both the intensional definition and these to instances of classes represented in different schemata. The logic language and its usage in the process of building the integrated schema is part of a complete system whose main aim is the easy and homogeneous access to cooperative information systems