simple path query

基本解释

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。
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）。
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。