Name: voting-update-request
Type: request
Purpose: >
  Update voting attributes
Response: voting-update-confirmation
Inherits: message
Elements:
  Signature: { required: true }
  From: { required: true }
  Event-Id: { required: true, type: identifier, class: event }
  Voting-Id: { required: true, type: identifier, class: voting }
  Voting-Data: { required: true, type: object, class: voting }
Rejection-Codes:
  22: Invalid period start
  23: Invalid period end
  31: Sender is not authorized to update voting
  41: Event does not exist
  42: Voting does not exist
  43: Voting cannot be updated anymore
  44: Event has been declared as finished