That simple step could lead to a new access path that might dramatically improve query performance.

这个简单的步骤可能产生新的访问路径，可能显著改进查询性能。

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At first, an algorithm is proposed, which rewrites a regular path expression based XML query as a group of simple path expression based queries using mapping information (mapping graph).

首先提出了一个利用映射信息(映射图)将带正则路径表达式的XML查询重写为一组简单路径查询的算法。

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XML query includes content query and structural query. The query condition can be represented as a simple path expression (SPE) or a regular path expression (RPE).

XML查询包含内容查询和结构查询，其查询条件可表示为简单路径表达式(SPE)和正则路径路径表达式(RPE)。

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