User-Defined Visual Query Languages
نویسنده
چکیده
Previous research in visual query languages has fo-cused on pre-deened visual representations of data and queries, which are suitable for speciic applications, but diicult to extend and generalize. In this paper we propose a metalanguage to query an object-oriented database with user-deened pictures. By manipulating these pictures, the user can extract information about the data in a purely visual fashion. The proposed metalanguage is rule-based and uses a constraint visual language that allows for complex displays such as graphs, bar charts, pie charts, and plot charts to be speciied. Our approach extends object-oriented concepts, such as inheritance and genericity to visual query languages. We provide examples that illustrate the expressiveness of the user-deened visual languages to display and query data.
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