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Return ref属性可以引用不同的类型或者为空。

youdao

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。

youdao

It was a puzzle to the Glasgow fans why the officials spurned the chance to refer the incident to the video ref.

BBC: Glasgow 11-11 Munster