DVQ: Towards Visual Query Processing of XML Database Systems |
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Authors: | Zheng Shihui Zhou Aoying Zhang Long Lu Hongjun |
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Affiliation: | (1) Department of Computer Science & Engineering, Fudan University, Shanghai, 200433, China;(2) Computer Science Department, Hong Kong University of Science & Technology, Hong Kong, China |
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Abstract: | XML has been recognized as a promising language for data exchange over the Internet. A number of query languages have been proposed for querying XML data. Most of those languages are path-expression based. One difficulty in forming path-expression based queries is that users have to know the structure of XML data against which the queries were issued. In this paper, we describe a DTD-driven visual query interface for XML database systems. With such an interface, a user can easily form path-expression based queries by clicking elements in the DTD tree displayed on the screen and supplying conditions if necessary. The interface and the query generation process are described in detail. |
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Keywords: | XML DTD visual query path expressions |
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