Abstract
This chapter illustrates multi-agent system technology in distributed database systems. The inland water (IW) databases are heterogeneous with respect to their database schema and the multi-lingual terms. The external core of Environmental Data Exchange Network-IW (EDEN-IW) system consists of two Web portals. The first is a user portal and the second is the data Resource Web portal. The internal core of EDEN-IW system consists of a semantic Web-type ontology model plus a multi-agent system (MAS). The EDEN-IW system is able to handle information retrieval and integration from many heterogeneous databases. The main EDEN-IW system requirements are to support high-level queries in terms of query transparency and data harmonization. A representation of database metadata in terms of an ontology model is used to classify domain concepts and properties. The use of an ontology model enhances information queries and information searches. The use of the MAS model provides a semantic metadata processing and distribution framework.
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