Does the Topic format in PubSub MQTT UADP contain redundant information?|OPC UA Standard|Forum|OPC Foundation

Hello,

I have a question about the concept of the Topic in PubSub MQTT UADP. As what I read in here , the official Topic format should be: 

<Prefix>/<Encoding>/metadata/<PublisherId>/<WriterGroup>/<DataSetWriter>

The information of PublisherId, WriterGroup, and DataSetWriter are for directing sending data to the right data consumed node. 

However, as UADP  also contains the information about PublisherId, WriterGroupId, and DataSetWriterId, then these information seem to be redundant for me. 

Am I right, or was I misunderstanding something here?

Thank you in advance for your answers.