一种基于树状逻辑式的XML查询方法*

随着XML在各类数据表示中的广泛应用，XML文档的查询方法成为当前数据处理的一个重要问题。已有的研究如XPath和XQuery得到应用，但其查询表现存在一些缺点需要改进。从模板匹配的角度出发，基于谓词逻辑设计了树状逻辑表达式LXT。该表达式的特点是能以树状结构模板描述XML文档查询需求。在此基础上，进一步探讨了基于LXT表达式的XML文档查询方法，从数据的查询过滤、结果的组织构造与含义等方面描述了利用LXT的特点设计XML查询表现形式的基本思路。

XML query approach based on logic XML tree

With the wide application of XML in data representation and exchange, the query approach to XML document becomes a key problem in current data processing. Some studies such as XPath and XQuery had been adopted and applied, however, these works were still to be improved in query presentation.Following the idea of pattern matching,this paper designed a new logic tree expression called LXT which could present the XML query in a tree pattern. Further,discussed the XML approach to query XML document based on LXT expressions, including the features of filtering and constructing the query result,which illustrated the ideas of designing the XML query language with LXT.