DDEX messages allow categorising Resoucres in several ways:
- Firstly by separating sound recordings from videos, MIDI resources(*), images, text resources, pieces of software and sheet music. Each of these resource types have different attributes (e.g. a video might have a screen resolution whereas a MIDI resource may have an indication of the sound processor used to turn the MIDI instructions into sound waves.)
- Secondly by classifying each of the main types. A list of the types of sound recordings is shown on the right.
The following types exists for sound recordings
Other resource types have other lists.
Some companies use the information to automatically process data received. A Works licensor may, for instance automatically levy a royalty on all sound recordings being classified as being based on a MusicalWork. It is therefore essential for all message senders to ensure that correct resource types are provided.
(*) MIDIs are no longer available in ERN-4. Please use sound recordings instead.