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. 2004 Nov-Dec;11(6):523–534. doi: 10.1197/jamia.M1506

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Copyright © 2004, American Medical Informatics Association

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Figure 1. — Query Integration System—architectural overview. The QIS architecture is based on three middle-tier servers. The data source server (DSS) connects to disparate supported data sources. The Integrator Server (IS) stores, coordinates query execution, and returns query results to Web applications. The Ontology Server (OS) maps data sources' metadata and data elements to concepts in standard vocabularies. EAV/CR = Entity-Attribute-Value, with Classes and Relationships; RDBMS = Rational Database Management System; XML = extended markup language; UMLS = Unified Medical Language System.