Message Identifiers and Timestamps

MessageHeader and Bundle Ids and Identifiers

A message contains at least two important ids and one identifier:

the Bundle.id (Corresponds with the EnvelopeId in MedCom OIOXML Messages).
the MessageHeader.id (Corresponds with the LetterId in MedCom OIOXML Messages).
the Bundle.identifier

The Bundle.id is the unique id of a Bundle and is assigned by the FHIR framework. Each time a message is sent, the Bundle.id SHALL be changed to a new globally unique value. This SHALL be achieved by using a UUID. The Bundle.Id SHALL never be identical to a former sent Bundle.id.

The Bundle.identifier is also a unique identifier of a Bundle, but can be assigned explicitly by the sending application. The Bundle.identifier MAY be the assigned the same value as the Bundle.id.

The MessageHeader.id is the unique id of a MessageHeader and is assigned by the FHIR framework. Each time a new message is created, it SHALL be assigned a MessageHeader.id, that is globally unique. MessageHeader.id SHALL never be identical to a former sent MessageHeader.id.

When a receiver receives and processes the message, it SHALL respond with an Acknowledgement (a new message) with a new MessageHeader.id wrapped in a Bundle which also has a new Bundle.id. The response message SHALL also quote the request MessageHeader.id in MessageHeader.response.identifier so that the source system can relate the Acknowledgement to its request.

Message Timestamps

A message has several important timestamps:

Bundle.timestamp: Bundle.timestamp SHALL contain the time the message was assembled
Provenance.occuredDateTime: The Provenance.occuredDateTime SHALL be a human readable time the message was sent
Provenance.recorded: The Provenance.recorded SHALL be a machine understandable time the message was sent

In addition, the message MAY have additional timestamps in additional resources in the message. The meaning of these will depend on the message event.

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The version of this documentation is: Version 1.0.8 You can finde the release note of the version here.

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