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Adaptive Data Mediation over XML Data

机译:基于XML数据的自适应数据中介

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The mediator/wrapper approach is used to integrate data from different databases and other data sources by introducing a middleware virtual database that provides high level abstractions of the integrated data. A framework is presented for querying XML data through such an Object-Oriented (OO) mediator system using an OO query language. The mediator architecture provides the possibility to specify OO queries and views over combinations of data from XML documents, relational databases, and other data sources. In this way interoperability of XML documents and other data sources is provided. Translation rules are defined that automatically generate an OO schema in the mediator database from the DTD of the XML documents, if available. A strategy is used for minimizing the number of types (classes) generated in order to simplify the querying. If XML documents without DTDs are read, or if the DTD is incomplete, the system extends the OO schema from the XML structure while reading XML data. As more XML data is read the OO schema is dynamically refined. This requires that the mediator database is capable of dynamically extending and modifying the OO schema. The paper overviews the architecture of the system and describes incremental rules for translating XML documents to OO database structures.
机译:中介器/包装器方法用于通过引入中间件虚拟数据库来集成来自不同数据库和其他数据源的数据,该中间件虚拟数据库提供集成数据的高级抽象。提出了一种框架,用于使用OO查询语言通过这样的面向对象(OO)中介系统查询XML数据。中介者体系结构提供了对来自XML文档,关系数据库和其他数据源的数据组合指定OO查询和视图的可能性。这样,就提供了XML文档和其他数据源的互操作性。定义了转换规则,该规则将从XML文档的DTD(如果有)中自动在介体数据库中生成OO模式。为了简化查询,使用一种策略来最小化生成的类型(类)的数量。如果读取了没有DTD的XML文档,或者DTD不完整,则系统在读取XML数据时会从XML结构扩展OO模式。随着读取更多X​​ML数据,OO模式将得到动态优化。这就要求中介者数据库能够动态扩展和修改OO模式。本文概述了系统的体系结构,并描述了将XML文档转换为OO数据库结构的增量规则。

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