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。
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).
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。
That simple step could lead to a new access path that might dramatically improve query performance.
通过路径表达式可以更简单地表达相同的查询
The same query can be expressed somewhat more concisely as a path expression, as shown in Listing 15.
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