Abstract
AbstractUncertainty extensively exists in data and knowledge intensive applications, in which fuzzy information processing plays a crucial role, and for this reason fuzzy data modeling has been extensively investigated in various database models. In particular, Zadeh’s fuzzy set theory has been extensively used to enhance various database models for managing fuzzy data. This has resulted in numerous contributions, mainly with respect to the context of traditional data models, including relational databases, object-oriented databases and XML data model. Therefore, topics related to the modeling of fuzzy data are considered very interesting in RDF since it is the current standard data representation and exchange format over the Web. In particular, various fuzzy database models (fuzzy relational database model and fuzzy object-oriented database model) need to be used for mapping to and from the fuzzy RDF models. Therefore, in this chapter, we mainly introduce several fuzzy database models, including fuzzy relational database model, fuzzy object-oriented database model and fuzzy XML model. Before that, we briefly introduce some notions of fuzzy set theory.
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