There is no type conversion for SDO reference properties.
SDO 引用属性没有类型转换。
We will look at the various QoS options here by examining the reference properties.
这里我们将通过检查引用属性来查看各种QoS选项。
Reference properties allow the data object to refer to values held in other locations.
引用属性允许数据对象引用其他位置保存的值。
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