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Several commercial applications, such as online comparison shopping and process automation, require integrating information that is scattered across multiple websites or XML documents. Much research has been devoted to this problem, resulting in several research prototypes and commercial implementations. Such systems rely on wrappers that provide relational or other structured interfaces to websites. Traditionally, wrappers have been constructed by hand on a per-website basis, constraining thedoi:10.1145/375551.375556 dblp:conf/pods/RajaramanU01 fatcat:vv6sh2peerfw7acqxsm3itudza