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Functional Dependency based on XML Node Sets

机译:基于XML节点集的功能依赖

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As an essential basis of relational database theory,integrity constraints such as functional dependency providea basis for well-designed databases. Integrity constraints arealso useful for the normalization of the XML schema designin the expensive applications of XML data. As a semistructurefeature, XML data are usually located by a pathexpression and multiple data items may be represented bythe same path. Thus, functional dependencies for XMLshould be constraints between sets of XML data items if thepath expression is used. These constraints also result in dataredundancy. Same as functional dependency, this kind ofdata redundancy for XML can lead to update anomalies too.This paper proposes a kind of XML integrity constraint todescribe the dependent relationship between different sets ofXML data items, and defines a general functional dependencybased on XML node sets. Moreover, this paper proposesa group of inference rules for the implication problem ofthe XML functional dependency, and proves that they aresound and complete.
机译:作为关系数据库理论的必要基础,完整性约束(例如功能依赖项)为设计良好的数据库提供了基础。在昂贵的XML数据应用程序中,完整性约束对于XML模式设计的规范化也很有用。作为半结构特征,XML数据通常由路径表达式定位,并且多个数据项可以由同一路径表示。因此,如果使用路径表达式,则XML的功能依赖性应该是XML数据项集之间的约束。这些限制还导致数据冗余。与功能依赖项一样,这种XML数据冗余也可能导致更新异常。本文提出了一种XML完整性约束,以描述不同XML数据项集之间的依赖关系,并定义了一个基于XML节点集的通用功能依赖项。此外,本文针对XML功能依赖的隐含问题提出了一组推理规则,并证明它们是合理且完整的。

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