The REF USING INTEGER clause specifies that the INTEGER data type will be used to represent the REFERENCE type of this structured type and all of its subtypes.

REF USINGINTEGER子句指定了 INTEGER数据类型，将使用这个数据类型表示该结构化类型及其所有子类型的 REFERENCE 类型。

youdao

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。

youdao

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。

youdao