By Laura C. Rivero, Jorge H. Doorn, Viviana E. Ferraggine

There are a myriad of recent instructions during which databases are becoming, offering new and fascinating demanding situations that promise flux within the entire society, end result of the impression and adjustments the database structures have provoked virtually all over the place in smooth existence. This levels from the best way the organisations function and make their enterprise judgements, to using moveable units with database involvements. The Encyclopedia of Database applied sciences and functions is a wide-ranging number of assorted assurance of issues on the topic of database suggestions, applied sciences, and purposes - offering an summary of the cutting-edge of classical topics. It additionally offers transparent and concise reasons of rising matters and applied sciences reminiscent of multimedia database structures, information warehousing and mining, geospatial and temporal databases, and information opposite engineering. Contributions from hundreds of thousands of overseas researchers make this ebook a beneficial unmarried reference resource in any library regarding database applied sciences and purposes.

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Reasoning: The ability of a system to find implicit consequences of its explicitly represented knowledge. Such systems are therefore characterized as knowledge-based systems. KEY TERMS Assertional Reasoning: A description logic knowledge base is made up of two parts, a terminological part (the terminology or Tbox) and an assertional part (the Abox), each part consisting of a set of axioms. The AbBox contains extensional knowledge that is specific to the individuals of the domain of discourse. There has been a great deal of work on the development of reasoning algorithms for expressive DLs, but in most cases these only consider Tbox reasoning.

1998). ECA rule processing in distributed and heterogeneous environments. Proceedings of the 14th International Conference on Data Engineering, Washington, February. , & Grazziotin-Ribeiro, H. (1998). Toward a semantic event service for database applications. Proceedings of the 9th International Conference, DEXA98 (pp. 16-27). , & Grazziotin-Ribeiro, H. (2000). Active services for data-intensive distributed applications. Proceedings of the International Symposium (IDEAS 2000), IEEE, 0-7695-0789-1 (pp.

Moreover, systems using these algorithms have also been developed (Haarslev & Möller, 2001; Horrocks, 1998). Most of these approaches only deal with Tbox reasoning, but in an environment like the Semantic Web, we also need Abox reasoning. Although some DL systems provide sound and complete Abox reasoning, they provide very weak Abox query language. A query means retrieving instances that satisfy certain restrictions or qualifications and hence are of interest for a user. Figure 3. OWL class constructors Figure 4.

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