Exploitation of Interschema Knowledge in a Multidatabase System
نویسندگان
چکیده
We describe a logic language to formally express interdependencies between classes belonging to different schemas, the socalled interschema knowledge. These interdependencies allow a designer of a multidatabase (MDB) to establish relationships between both the intensional definition and the set of instances of classes represented in different schemas. These assertions form the „backbone“ of the MDB and we may benefit in several ways from the possibility of reasoning about them. In this paper, we present two applications of interschema knowledge, namely schema integration and global query processing and optimization.
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