Description: OGSA-DAI data services through a single back-end data source query, push the whole string of SQL statements sent to the back-end database, execute the query. In the distributed data sources for the DQP query, combined query is resolved in the middle layer for different data sources for the sub-query, sub query DAI data services through access to query results, and the middle layer in the DQP return different data sources The results were assembled, and returned to the requesting user.
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DQPDevelopersGuide.doc
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