There is no need to explicitly reference the attribute group in either complex type definition.
无需在每个复杂类型定义中显式地引用属性组。
If you want to add an attribute, you must define price as a complex type.
如果希望增加属性，您必须把price元素定义成复杂类型。
If you want to add an attribute, you must define price as a complex type.
如果希望增加属性，您必须把price元素定义成复杂类型。
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