基于节点集的XML查询技术研究

XML Query Technology Research Based on Node-Set

摘要: 复杂路径表达式查询是XML查询的核心研究内容。针对长路径表达式，尤其是在查询中间结果较多，节点索引的连接操作代价较大的情况下，提出了一种基于节点集的索引方式。该方式支持节点集间的投影操作、选择操作以及高效的结构连接，从而实现数据的快速查询并形成基于节点集的XML查询模式。同时该模式为XML基于路径的查询处理提供了更多的选择。

Abstract: XML query languages take complex path expressions as their core. According to the long path ex- pression, especially Production of a large amount of intermediate results; the larger price can be spent on joining operation of indexical nodes. This paper put forward a model which supports projection operation; choose operation and high efficient structure connection in node set. Meanwhile, this model provides path query processing with more choices.