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In many scenarios, a contingent data source may benefit by coordinating with external heterogeneous sources upon which it depends. The administrator of this contingent source needs to update it when changes are made to the external base sources. For example, when a building design is updated, the contractor's cost estimate must be updated, too. The goal of data coordination is to update a contingent source, C, based on changes to an independently maintained base source, B. This paper introducesdblp:journals/pvldb/LawrencePS11 fatcat:zl3vhvotsbexnegmwygm5symxa