This thesis aims at the efficiency problem of accuracy and recall rate in XML retrieval. Based on tree matching, the thesis makes a further study on the XML retrieval technology about metadata.
本文围绕查全率和查准率的效率问题，引入树匹配思想，对基于XML的元数据检索进行了深入的研究。
The cluster representative was constructed by three successive steps named Tree matching, Tree merging and Tree pruning.
为了构建聚类代表，算法通过构造最佳匹配树，合并树，修剪树三步来实现。
The cluster representative was constructed by three successive steps named Tree matching, Tree merging and Tree pruning.
为了构建聚类代表，算法通过构造最佳匹配树，合并树，修剪树三步来实现。
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