为此，需使用一个XPath表达式来识别由XML数据组成的部分，通常为一个特定的XML文本节点，它会返回所有关系数据值。
To do this, an XPath expression is used to identify the portion of the XML data, normally a specific XML text node, that returns each relational data value.
SQL标准xmltable函数提供了一种简单的方法，可以提供一组将XML映射到相应关系值的XPath表达式。
The SQL standard XMLTABLE function provides a straightforward way to provide the set of XPath expressions mapping the XML to desired relational values.
根据该差分方程的特征值表达式讨论了AGC模型设定序列的稳定区域和稳态误差与AGC模型参数之间的关系。
On the basis of the expression of characteristic value of the differential equation, the relationship between the stable domain, steady state, steady-state error and AGC model parameters is discussed.
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