5.1 Introduction

This Part 3 of the ECM standard describes the choreography of the communication of duplicate ISRC cluster data, using two messages defined in Clause 6:

1. The DuplicateIsrcClusterNotification; and

2. The DuplicateIsrcClusterRequest.

In addition to these, Part 3 of the ECM standard makes use of two messages specified in Part 1, ECM Communication Protocol (ECM-C), namely:

3. A Manifest that may be used to communicate the messages defined in this Part 3 of the ECM message in batches; and

4. An Acknowledgment that may be used to acknowledge the receipt of a message.

This Part 3 of the standard does not define the underlying transport, network, or messaging technology used to convey these messages. This is also specified in Part 1 of the ECM standard.

Figure 1 – Choreography for the DuplicateIsrcClusterNotification

The message exchange defined herein occurs between one sender and one recipient. The DuplicateIsrcClusterNotification message structure may be used for both the initial message and the response message (see Figure 1), ensuring a consistent and complete representation of the cluster at the two different times of exchange.

The DuplicateIsrcClusterRequest (Figure 2) is optional and may be used in specific workflows where the sender seeks to request the creation or specification of a Duplicate ISRC Cluster by specifying at least one member Resource that it anticipates will form part of a Duplicate ISRC Cluster subsequently created by the message recipient. The specified Resource may ultimately be determined to be the ClusterRoot or merely a ClusterMember.

For each Resource included in the request, the sender of the message shall provide sufficient information to enable identification of the Resource.

The response to a DuplicateIsrcClusterRequest shall be a DuplicateIsrcClusterNotification, which communicates the resulting cluster data to the requesting party.

Figure 2 – Choreography for the DuplicateIsrcClusterRequest

Table 1 below summarises the data exchange choreography and the points at which the messages defined in this part of the standard are sent.

Table 1 – Messages defined in Part 3 of the ECM standard