The action-request Topic has the form:

<Prefix>/<Encoding>/action-request/<Responder>/<WriterGroup>

The <Responder> Topic level is the PublisherId for the Responder of the Actions.

The <WriterGroup> Topic level is the name of a WriterGroup.

The action-request Topic level is the default if the system owner does not have their own Topic tree. The Topic actually used is specified in the Responder message as QueueName in the WriterGroup TransportSettings.

The messages are instances of the ActionRequest MessageType (see 7.2.2).

The corresponding Responder message is sent to the Topic with the same <Prefix>, <Encoding> and <Responder>. The PubSubConnection specifies the WriterGroups and DataSetWriters for a Responder.