一种查询XML异构数据源的新方法

A Novel Approach to Query Heterogenous Data Sources Based on XML

由于异构数据源存在结构差异和结构不兼容等问题,在其上进行查询是一个挑战。本文根据XML树的特点,对其进行了外延,设计了一种新的XML树的查询方法。通过样式图获得XML树的结点间的语义关系,查询条件可以表示为XML样式图模式,查询不被限定于特定的XML树,给出了基于样式图模式的查询算法。用例说明了该方法如何应用于异构数据源的查询。

Querying heterogenous sources is a challenging issue due to structural differences and structural inconsistencies. Based on the characteristics of XML and several extensions on the XML tree,a novel querying approach is proposed for XML trees. A semantic relationship between nodes in XML trees is captured by the concept of a schema graph. Queries are specified on the schema graph patterns of the schema graph. A query is not restricted by the structure of a specific XML tree. A technique for evaluating queries is presented. Experimental results show how the approach can be used to query multiple XML trees in the presence of structural differences and inconsistencies.