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=Health Information Event Messaging (HIEM)= For questions, feedback, and open issues being addressed for this specification, visit the Implementer Questions and Feedback Page

Please visit the Nationwide Health Information Network Inventory page on the ONC website in order to access the latest version of this specification.

Specification Definition
Defines an information exchange service which allows NHIOs to request to subscribe or unsubscribe to various classes of content and events, and to notify NHIOs when content or events matching a subscription have been created or modified. Any NHIO seeking to utilize the pub/sub exchange pattern must utilize the HIEM service and apply the relevant HIEM Profile.

Transaction Standard
This specification identifies the WS-BaseNotification standard from OASIS as the base standard for HIEM messages. Only the following messages from WS-BaseNotification are required: WS-BaseNotification also defines a “Renew” message to extend the life span of a subscription; however, this specification does not make use of time-limited subscriptions, so the “Renew” operation is not required. This specification further recognizes the WS-Topics standard from OASIS as the standard for identifying classes of content and events to which an NHIO may subscribe and of which an NHIO may notify. The WS-Topics standard contains four (4) dialects for expressing topics. The default dialect for HIEM transactions is the “Concrete” dialect. However, specific topic profiles may require other dialects. Profiles that require alternative dialects will define them.
 * Notify
 * Subscribe
 * SubscribeResponse
 * Unsubscribe
 * UnsubscribeResponse