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Peer-to-Peer Integration
In all the structured query-based data integration and warehousing architectures we have described so far in this book, one must create a mediated schema or centralized database for the domain of the data integration application, before any queries may be posed. This task requires significant modeling, maintenance, and coordination effort among the owners of the data sources. In particular, creating a mediated schema entails that the scope of the domain be well defined and that there exists a clearly identifiable schema for it, which is not necessarily true. For example, consider data sharing in a scientific context, where data may involve scientific findings from multiple disciplines, such as genomic data, diagnosis ...
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