Capability based mediation in TSIMMIS
Chen Li, Ramana Yerneni, Vasilis Vassalos, Héctor García-Molina, Yannis Papakonstantinou, Jeffrey David Ullman, Murty Valiveti · 1998
Introduction The TSIMMIS system [1] integrates data from multiple heterogeneous sources and provides users with seamless integrated views of the data. It translates a user query on the integrated views into a set of source queries and postprocessing steps that compute the answer to the user query from the results of the source queries. TSIMMIS uses a mediation architecture [11] to accomplish this (Figure 1). User Source 1 Source 2 Source N Mediator Figure 1: The TSIMMIS Architecture Many other data integration systems like Garlic [2, 9] and Information Manifold [4] employ a similar architecture. One of the distinguishing features of TSIMMIS is its use of a semi-structured data model (called the Object Exchange Model or OEM [7]) for dealing with the heterogeneity of the data sources. In particular, it employs source wrappers [3] that provide a uniform OEM interface to the mediator. In SIGMO