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Forms-based query interfaces are widely used to access databases today. The design of a forms-based interface is often a key step in the deployment of a database. Each form in such an interface is capable of expressing only a very limited range of queries. Ideally, the set of forms as a whole must be able to express all possible queries that any user may have. Creating an interface that approaches this ideal is surprisingly hard. In this paper, the authors seek to maximize the ability of a forms-based interface to support queries a user may ask, while bounding both the number of forms and the complexity of any one form.
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