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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You can create a simple constraint expression to check data for a simple condition;

可创建简单的约束表达式，用简单条件检查数据；

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You can create a simple constraint expression to check data for a simple condition;

可创建简单的约束表达式，用简单条件检查数据；

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