Abstract : To improve query processing, various numbering schemes for XML documents are proposed.
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To improve the efficiency of query processing, data replication method is used in some data integration systems.
一些数据集成系统为了提高查询处理的效率，采用数据复制方法。
As the core operation of XML query processing, the efficient implementation of structural join is the key to improve XML query processing.
作为XML查询处理的核心操作，结构连接操作的高效实现是提高查询处理效率的关键。
This paper proposes how to improve the ability of processing the implicit knowledge of the database of the query sentences.
本文增强了对查询语句中的数据库隐含知识的处理能力。
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