PICSEL and Xyleme: two illustrative information integration agents

Authors:
Marie-Christine Rousset;Chantal Reynaud
Affiliations:
University of Paris Sud, CNRS, L.R.I & INRIA (Futurs), LRI, Orsay Cedex, France;University of Paris Sud, CNRS, L.R.I & INRIA (Futurs), LRI, Orsay Cedex, France
Venue:
Intelligent information agents
Year:
2003

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Abstract

An information integration agent provides a uniform query interface to a collection of distributed and heterogeneous information sources, giving users or other agents the illusion that they interrogate a centralized and homogeneous information system. In this chapter we focus on integration information agents that follow a mediator approach. A mediator is based on the specification of a single mediated schema describing a domain of interest, and on a set of source descriptions expressing how the content of each source available to the system is related to the domain of interest. These source descriptions, also called mappings because they model the correspondence between the mediated schema and the schemas of the data sources, play a central role in the query answering process. We present two recent information integration agents, namely Picsel and Xyleme, which are illustrative of two radically different choices concerning the expressivity of the mediated schema.