Abstract

XML has been the de-facto standard of information representation and exchange over the web. In addition, imprecise and uncertain data are inherent in the real world. Although fuzzy information has been extensively investigated in the context of relational model, the classical relational database model and its fuzzy extension to date do not satisfy the need of modeling complex objects with imprecision and uncertainty, especially when the fuzzy relational databases are created by mapping the fuzzy conceptual data models and the fuzzy XML data model. Based on possibility distributions, this chapter concentrates on fuzzy information modeling in the fuzzy XML model and the fuzzy nested relational database model. In particular, the formal approach to mapping a fuzzy DTD model to a fuzzy nested relational database (FNRDB) schema is developed.

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