可以使用XML extender函数进行子文档查询。
Subdocument queries can be made using XML Extender functions.
这些方法扩展了XML文档查询范围，提高了文档的查全率和查准率。
They extend scope for searching XML documents, and improve recall and precision for searching XML documents.
实验证明该算法扩展了XML文档查询范围，提高了文档的查全率和查准率。
It extends scope for searching XML documents, and improves recall and precision for searching XML documents by experiments.
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