By Eduardo Mena
This paintings is a revision of the doctoral dissertation of Eduardo Mena pre sented to the dept of desktop technology and method Engineering on the collage of Zaragoza (Spain) in November 1998 [Mena 98]. The OBSERVER process was once constructed due to this Ph.D. thesis. This publication consists of 8 chapters. In bankruptcy 1 we introduce our purpose for writing a publication approximately platforms that method queries in international info structures. Then in bankruptcy 2 we evaluate the techno logical context for our paintings, together with allotted and heterogeneous environments and using ontologies. We additionally evaluate similar paintings to our personal. bankruptcy three offers our proposed worldwide method structure for question processing in international details structures. the most modules within the structure and the most steps given to method a question are in short brought. Chapters four via 7 offer a close description of every question processing step. In bankruptcy four we aspect the stairs had to entry the information corre sponding to a question formulated over an ontology. all of the elements concerning distribution, structural and semantic heterogeneity, and limited question features of the underlying information repositories are thought of during this bankruptcy. the most gains of the mapping info that relates ontologies and knowledge repositories also are defined. eventually, we exhibit the method of producing acceptable plans to entry each one concerned reposi tory and the correlation of the solutions coming from varied reposito ries.
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