  Data integration is one of the main problems in distributed data sources. An
approach is to provide an integrated mediated schema for various data sources.
This research work aims at developing a framework for defining an integrated
schema and querying on it. The basic idea is to employ recent standard
languages and tools to provide a unified data integration framework. RDF is
used for integrated schema descriptions as well as providing a unified view of
data. RDQL is used for query reformulation. Furthermore, description logic
inference services provide necessary means for satisfiability checking of
concepts in integrated schema. The framework has tools to display integrated
schema, query on it, and provides enough flexibilities to be used in different
application domains.
