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We consider pragmatic issues in applying constraint-based theories (such as that developed for data exchange) to a variety of problems. We identify disconnects between theoreticians and tool developers, and propose principles for creating problem units that are appropriate for tools. Our Downstream Principle then explains why automated schema mapping is a prerequisite to transitioning schemamatching prototypes. Next, we compare concerns, strengths, and weaknesses of database and AI approachesdoi:10.1109/icdew.2006.111 dblp:conf/icde/RosenthalS06 fatcat:3jkpu3fcgffehck4y5gl243alq