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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"There is a simple path to replacing petroleum in this country in the next 25 years, and it doesn't cost consumers or the government, " says Khosla.

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"There is a simple path to replacing petroleum in this county in the next 25 years, and it doesn't cost consumers or the government, " says Khosla.

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Many linear thinkers believe that to solve a problem, you need to follow a simple, logical path, a step-by-step sequence involving two variables.

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