US HITSP: T29: Notification of Document Availability Transaction. The NAV Integration Profile introduces a mechanism allowing notifications to be sent point-to-point to systems within a Cross-Enterprise Document Sharing Affinity Domain (See “IHE IT Infrastructure Cross-Enterprise Document Sharing (XDS) Integration Profile”), eliminating the need for manual steps or polling mechanisms for a Document Consumer to be aware that documents of interest have been registered with an XDS Document Registry Actor.