The database catalog of a database instance consists of metadata in which definitions of database objects such as basis tables, view tables, synonyms, value ranges, indexes, users, and user groups are stored.
Published in Chapter:
Looking for Information in Fuzzy Relational Databases Accessible Via Web
Carmen Martínez-Cruz (University of Jaén, Spain), Ignacio José Blanco (University of Granada, Spain), and M. Amparo Vila (University of Granada, Spain)
Copyright: © 2008
|Pages: 23
DOI: 10.4018/978-1-59904-847-5.ch018
Abstract
The Semantic Web has resulted in a wide range of information (e.g., HML, XML, DOC, PDF documents, ontologies, interfaces, forms, etc.) being made available in semantic queries, and the only requirement is that these are described semantically. Generic Web interfaces for querying databases (such as ISQLPlus©) are also part of the Semantic Web, but they cannot be semantically described, and they provide access to one or many databases. In this chapter, we will highlight the importance of using ontologies to represent database schemas so that they are easier to access. The representation of the fuzzy data in fuzzy databases management systems (FDBMS) has certain special requirements, and these characteristics must be explicitly defined to enable this kind of information to be accessed. In addition, we will present an ontology which allows the fuzzy structure of a fuzzy database schema to be represented so that fuzzy data from FDBMS can also be available in the Semantic Web.