One Binary for each Resource Composite

To indicate that a binary (a.k.a. Resource file such as an AAC-encoded sound recording) is being communicated as part of a Release delivery, the Message Sender needs to provide a TechnicalSoundRecordingDetails composite for the relevant Resource. Conversely, the absence of a TechnicalSoundRecordingDetails composite for a specific Resource indicates to the recipient, that no binary is being delivered at this stage. The most typical case for this is an update to a previously sent NewReleaseMessage.

DDEX distinguishes between "primary" and "secondary" Resources.

The former are  "Resources that are a main Resource of a Release" whereas the latter are "Resources that are not a main Resource of a Release supporting the Primary Resources (examples are lyrics, cover art etc)". Whether a Resource is deemed to be primary or secondary for a given Release is communicated in the ResourceGroup with the appropriate flag.

However, to simplify the processing, DDEX has agreed rules as to what binaries can be communicated and/or omitted under which circumstances. These rules are as follows:

This approach has been chosen to simplify implementations – it is acknowledged that this approach may lead to an increased amount of  data to be transferred.

Multiple Resource Files for each Resource Composite

It is possible, that more than one binary needs providing for a single Resource composite. This allows offerings with different sound quality levels or with DRM-protected and unprotected files for a single Release.

To indicate that multiple binaries are communicated for for a single Resource, the Message Sender must provide  one TechnicalSoundRecordingDetails composite for each binary. Thus a delivery of a Release with ten sound recordings plus one image, where all sound recordings are provided in (lossy compressed) MP3 and (losslessly compressed) FLAC, would contain of 2*10+1 = 21 binaries.

The above rules about sending binaries to all primary Resources when one primary Resource needs to be communicated is still in force and needs extending:

The same rule applies to secondary Resources.