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@INPROCEEDINGS{Hammer95informationtranslation,,
    author = {Joachim Hammer and Hector Garcia-molina and Kelly Irel and Yannis Papakonstantinou and Je Rey Ullman and Jennifer Widom},
    title = {Information translation, mediation, and mosaic-based browsing in the tsimmis system},
    booktitle = {In Proceedings of the ACM SIGMOD International Conference on Management of Data},
    year = {1995},
    pages = {48--3}
}

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Abstract:

The tsimmis project [2] provides an architecture and tools for accessing multiple heterogeneous information sources by translating source information into a common self-describing object model, called the Object Exchange Model (OEM) [3]. tsimmis provides integrated access to heterogeneous sources through a layer of source speci c translators as well as \intelligent " modules, called mediators. Translators (wrappers) convert queries over information in the common model (OEM) into requests the source can execute. The data returned by the source is converted back into the common model. Mediators are programs that collect information from one or more sources, process and combine it, and export the resulting information to the end user or an application program. Users or applications can choose to interact either directly with the translators or indirectly via one or more mediators. Figure 1 shows an overview of the tsimmis testbed as it is currently operating in our lab. We distinguish three di erent layers: the source layer, the server layer, and the client layer. Starting at the bottom (source layer), we can see three (disk-shaped) heterogeneous information sources, containing bibliographic data in three heterogeneous formats: 1. A University-owned bibliographic library called folio which is accessed through an interactive

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