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The availability of geographic and geospatial information and services, especially on the open Web has become abundant in the last several years with the proliferation of online maps, geo-coding services, geospatial Web services and geospatially enabled applications. The need for geospatial reasoning has significantly increased in many everyday applications including personal digital assistants, Web search applications, local aware mobile serv...

Information mediators are a proven technology for achieving one-stop integrated access to information in distributed, heterogeneous information sources. This book describes the work in a doctoral dissertation on optimizing performance in information mediators. Performance, particularly query response time, is an issue in such systems as data has to be retrieved from remote information sources at real-time. This dissertation proposes and valida...