In the example for this article, ProductCode type was defined using pattern facet.

在本文的例子中，Productcode类型就是使用模式面(pattern facet)定义的。

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(The examples in this article to this point have been user-defined simple types (see ProductCode)).

(到目前为止本文中的例子都是用户定义的简单类型，比如productCode)。

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For example, the values of derived simple type ProductCode is a subset of the values of base type string.

比如，派生简单类型ProductCode的值是基类型string值的子集。

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For example, the values of derived simple type ProductCode is a subset of the values of base type string.

比如，派生简单类型ProductCode的值是基类型string值的子集。

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