179/* Publisher MUST include an <item/> element, which MAY be empty or contain a payload; if item ID is not provided by publisher, it MUST be generated by pubsub service */
180
181// [Persistent - Payload]
182/* Publisher MUST include an <item/> element that contains the payload; if item ID is not provided by publisher, it MUST be generated by pubsub service */
183
184// [Transient - Notification]
185/* Publisher MUST NOT include an <item/> element (therefore item ID is neither provided nor generated) but the notification will include an empty <items/> element */
186
187// [Transient - Payload]
188/* Publisher MUST include an <item/> element that contains the payload, but the item ID is OPTIONAL */