The promotion detail block comprises the single data Group P.27. The block as a whole is optional and non-repeating, and is used only when there is a need to describe various promotional events intended to promote the product in a structured way. When used, the block usually consists of one or more instances of <PromotionalEvent>. It may be empty only within a partial or ‘block update’ (Notification or update type 04, see P.1.2), when the intention is to remove all previously-supplied promotion detail.