There have been a number of algorithms proposed for structural join, and most of them are based on one of the following assumptions: the input element sets either have indexes or are ordered.
目前已经提出了许多结构连接的算法，它们中的大多数都基于如下的前提条件之一：输入元素集合存在索引或者有序。
Structural join is the core operation in XML query processing, there have been a number of algorithms proposed for structural join, but all of them could not support query of multiple versions XML.
结构化连接是XML查询处理的核心操作，目前已经提出了许多结构化连接的算法，但都不支持多版本的XML文档。
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