Title :
Semantic cooperation of legacy information systems: an object-oriented framework
Author :
Dubois, Gilles ; Boulanger, Danielle
Author_Institution :
Lyon III Univ., France
Abstract :
When several legacy information systems have to cooperate, the issue is to define a global framework providing both semantic interoperability and loose coupling among heterogeneous local information sources. To conciliate such requirements, we propose an object-oriented framework dedicated to the semantic evaluation of global queries while respecting local autonomy. Several layers insure interoperability through application objects and actual cooperation at a meta-level composed of federative objects. A unified description of local data allows structural and semantic evaluations during query processing. To preserve local autonomy, the description is dynamically derived from local data structures. Federative objects exploit a cooperation protocol to coordinate the exchanges during query evaluation.
Keywords :
data structures; distributed databases; information systems; object-oriented databases; open systems; query processing; software maintenance; application objects; cooperation protocol; coordinated data exchange; federative objects; global framework; global query semantic evaluation; heterogeneous local information sources; legacy information systems; local autonomy; local data structures; loose coupling; meta-level; object-oriented framework; query evaluation; query processing; semantic cooperation; semantic interoperability; structural evaluations; unified local data description; Algebra; Artificial intelligence; Data structures; Databases; Information systems; Object oriented modeling; Power system modeling; Protocols; Query processing;
Conference_Titel :
Database and Expert Systems Applications, 1997. Proceedings., Eighth International Workshop on
Conference_Location :
Toulouse, France
Print_ISBN :
0-8186-8147-0
DOI :
10.1109/DEXA.1997.617336
