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    An object oriented data model for web and its algebra

    Zhang, Dell and Dong, Y. (1999) An object oriented data model for web and its algebra. In: UNSPECIFIED (ed.) TOOLS 1999: 31st International Conference on Technology of Object-Oriented Languages and Systems. IEEE Computer Society, pp. 83-88. ISBN 9780769503934.

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    XML (eXtensible Markup Language) has drawn significant attention as a standard for representation and exchange of data on the Web. But existing semistructured data models, such as OEM, cannot support XML naturally and fully. A new object oriented data model named XOM is proposed in this paper as the common data model for the Web data source. Based on rooted connected directed graph both cyclic and acyclic, whose nodes are labeled and edges are ranked, XOM can describe the aggregation relationship as well as the general reference relationship (linkage) between XML elements. Through ranked closure operation, both tree-oriented and graph-oriented models can be unified in XOM. As the formal foundation for query processing and optimization for Web data, a new algebra called XOM algebra, which includes six operations, i.e., object union, difference, select, project, paste and cut, is also proposed. In comparison with relational algebra, XOM algebra is more flexible and powerful.


    Item Type: Book Section
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Computing and Mathematical Sciences
    Depositing User: Sarah Hall
    Date Deposited: 15 Nov 2021 16:12
    Last Modified: 09 Aug 2023 12:52


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