Enumeration values should use names only (not Numbers) and the names used for enumeration values must conform to the guidelines for element or attribute names.
枚举值应只使用名称(不使用数字)并且用于枚举值的名称必须符合元素或者属性名称的指导原则。
It is needed when there should be a specific list of constant values to be used for the simple type defined by the enumeration.
当枚举定义的简单类型使用常数的特殊列表时，就会需要这种类型了。
It is needed when there should be a specific list of constant values to be used for the simple type defined by the enumeration.
当枚举定义的简单类型使用常数的特殊列表时，就会需要这种类型了。
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