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A Participant made of other Participants, where the assemblage is treated as a single unit. Participant Groups cover both composition and decomposition. The fact that a Participant is a Participant Group may not be known when the Participant is created; any Participant can be made into a Participant Group by adding a Participant Group element to it. For decomposition, consider a Production Company. The production company has key people (Producers, Directors), Organizations (Art Department, Location), and Services (Encoding, Transfer). These components might be managed separately by IT systems, financial budgeting systems and production management tools but at the highest level they are (and always have been) parts of the production company.
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