Name: badge-assignment
Type: request
Purpose: >
  Assign a badge to a participant.
Response: badge-details
Inherits: message
Elements:
  Signature: { required: true }
  From: { required: true }
  Event-Id: { required: true, type: identifier, class: event }
  Participant-Id: { required: true, type: identity }
  Badge-Code: { required: true, type: string, min_length: 3, max_length: 16 }
  Invalidate-Existing: { type: boolean }
Rejection-Codes:
  22: Event does not exist
  23: Participant does not exists
  31: Sender is not authorized to assign badges
  41: Badge has already been assigned to this participant
  42: Badge has already been assigned to another participant
  43: Participant has already been assigned a badge
  44: Badge has been invalidated
  91: Badge could not be assigned (reason unknown)