The action-metadata Topic has the form:

<Prefix>/<Encoding>/action-metadata/<Responder>/<WriterGroup>/<DataSetWriter>

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

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

The <Writer> Topic level the name of a DataSetWriter.

The action-metadata Topic 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 MetaDataQueueName in the DataSetWriter TransportSettings.

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

The corresponding PubSubConnection Messag e is sent to the Topic with the same <Prefix>, <Encoding> and <PublisherId>. The PubSubConnection specifies the WriterGroups and DataSetWriters for a Publisher.