中文摘要：

研究了基于图结构XML文档的关键字检索方法。根据图结构XML文档的结构特点,结合用户输入的关键字及其类型,建立了用户查询语义模型;定义了拥有完整语义信息的查询结果模型,并从层次结构上分析来定义结果的语义相关性排序方案;提出基于语义的双层索引结构。实验结果表明,算法具有较高的准确率和效率。

英文摘要：

Keyword search method is presented on graph-structured XML document.In accord ing with the fea-ture of graph-structured XML documents,considered the keyword and its type by user input,established the us-er＇s query semantic model;The paper define the resultsmodelwith complete semantic information,and obtain the semantic relevance sorting method from the hierarchical structure.Propose a double-level inverted index with se-mantic information.Extensive experiments evaluate the performance ofmethod has higher accuracy and efficiency.[K ey w ords] XML graph keyword query hierarchical joined Key words：search method is presented on graph-structured XML document.In according with the feature of graph-structured XML documents,considered the keyword and its type by user input,established the users query semantic model;The paper define the results model with complete semantic information,and obtain the semantic relevance sorting method from the hierarchical structure.Propose a double-level inverted index with semantic information.Extensive experiments evaluate the performance of method has higher accuracy and efficiency.