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Much data in the Web is hidden behind Web query interfaces. In most cases the only means to “surface” the content of a Web database is by formulating complex queries on such interfaces. Applications such as Deep Web crawling and Web database integration require an automatic usage of these interfaces. Therefore, an important problem to be addressed is the automatic extraction of query interfaces into an appropriate model. We hypothesize the existence of a set of domain-independent “commonsense design rules” that guides the creation of Web query interfaces.