一个基于高级数据模型的说明性XML更新语言
Declarative XML Update Language Based on a Higher Data Model
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摘要: 中文题目：一个基于高级数据模型的说明性XML更新语言在Lorel数据模型中，XML数据被建模为带标号边的有向图，一个节点表示一个XML元素，表示为一个对
基于XML-RL数据模型的优点，XML-RL更新语言给用户提供一种简单的易于理解的方式来修改XML文档；
（2）我们的语言以一个简单的非嵌套的方式来支持多个层次的修改更新操作；
（3）我们的语言在一个语法结构中可以同时支持不同更新操作的混合；
（4）我们的语言支持复杂对象的直接修改。这种操作是无法在基于图或基于树模型的更新语言中直接支持的；
（5）我们的语言以一种统一的方式来支持名字、值和对象的更新，而在其他语言中一般名字的更新与值或对象的更新使用不同的原语。-
关键词:
- XML /
- higher data model /
- update language
Abstract: With the extensive use of XML in applications over the Web, how toupdate XML data is becoming an important issue because the role ofXML has expanded beyond traditional applications in which XML isused for information exchange and data representation over theWeb. So far, several languages have been proposed for updating XMLdata, but they are all based on lower, so-called graph-based ortree-based data models. Update requests are thus expressed in anonintuitive and unnatural way and update statements are toocomplicated to comprehend. This paper presents a noveldeclarative XML update language which is an extension of theXML-RL query language. Compared with other existing XML updatelanguages, it has the following features. First, it is the onlyXML data manipulation language based on a higher data model.Second, this language can express complex update requests atmultiple levels in a hierarchy in a simple and flat way. Third,this language directly supports the functionality of updatingcomplex objects while all other update languages do not supportthese operations. Lastly, most of existing languages userename to modify attribute and element names, which is adifferent way from updates on value. The proposed language modifies tagnames, values, and objects in a unified way by the introduction ofthree kinds of logical binding variables: object variables,value variables, and name variables.-
Keywords:
- XML /
- higher data model /
- update language
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