The type specified must be derived from the declared type or a special simple type definition called xs: error (which has no valid instances).
指定的type必须派生于声明的类型或称为xs：error的特殊简单类型定义(没有有效实例)。
Basically, the construct element with a type name matches an element whose type definition is directly or indirectly derived from the specified type.
一般而言，带有类型名的构造element匹配类型定义直接或间接来自特定类型的元素。
Determines the type definition that this derived element is based upon.
确定此派生元素所基于的类型定义。
Determines the type definition that this derived element is based upon.
确定此派生元素所基于的类型定义。
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