As such, inconsistencies in the model will cause build failures. For example, an EOperationImpl may declare a certain return type, but the return ref property may refer to a different type or be null.
所以，模型中的不一致性将会导致构建失败，例如，一个EOperationImpl可以声明某种返回类型，但是Returnref属性可以引用不同的类型或者为空。
The ref attribute of element element allows you to refer to previously declared elements.
元素element的ref属性使您能够引用前面声明的元素。
The ref attribute of element element allows you to refer to previously declared elements.
元素element的ref属性使您能够引用前面声明的元素。
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