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A variety of integrity constraints have been studied for data cleaning. While these constraints can detect the presence of errors, they fall short of guiding users to correct the errors. Indeed, data repairing based on these constraints may not find certain fixes that are guaranteed correct, and worse still, may even introduce new errors when attempting to repair the data. The authors propose a method for finding certain fixes, based on master data, a notion of certain regions, and a class of editing rules. A certain region is a set of attributes that are assured correct by the users. Given a certain region and master data, editing rules tell users what attributes to fix and how to update them.
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