| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  MessageHeader | TU | DomainResource | A resource that describes a message that is exchanged between systems Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension | |
  event[x] | Σ | 1..1 | Event code or link to EventDefinition Binding: MessageEvent (Example) | |
  eventCoding | Coding | |||
  eventCanonical | canonical(EventDefinition) | |||
 destination | Σ | 0..* | BackboneElement | Message destination application(s) |
| endpoint[x] | Σ | 0..1 | Actual destination address or Endpoint resource | |
 endpointUrl | url | |||
| endpointReference | Reference(Endpoint) | |||
| name | Σ | 0..1 | string | Name of system |
| target | Σ | 0..1 | Reference(Device) | Particular delivery destination within the destination |
| receiver | Σ | 0..1 | Reference(Practitioner | PractitionerRole | Organization) | Intended "real-world" recipient for the data |
| sender | Σ | 0..1 | Reference(Practitioner | PractitionerRole | Device | Organization) | Real world sender of the message |
| author | Σ | 0..1 | Reference(Practitioner | PractitionerRole | Device | Organization) | The source of the decision |
| source | Σ | 1..1 | BackboneElement | Message source application |
| endpoint[x] | Σ | 0..1 | Actual source address or Endpoint resource | |
| endpointUrl | url | |||
| endpointReference | Reference(Endpoint) | |||
| name | Σ | 0..1 | string | Name of system |
| software | Σ | 0..1 | string | Name of software running the system |
| version | Σ | 0..1 | string | Version of software running |
| contact | Σ | 0..1 | ContactPoint | Human contact for problems |
| responsible | Σ | 0..1 | Reference(Practitioner | PractitionerRole | Organization) | Final responsibility for event |
| reason | Σ | 0..1 | CodeableConcept | Cause of event Binding: Example Message Reason Codes (Example) |
| response | Σ | 0..1 | BackboneElement | If this is a reply to prior message |
| identifier | Σ | 1..1 | Identifier | Bundle.identifier of original message |
| code | Σ | 1..1 | code | ok | transient-error | fatal-error Binding: Response Type (Required) |
| details | Σ | 0..1 | Reference(OperationOutcome) | Specific list of hints/warnings/errors |
| focus | Σ | 0..* | Reference(Any) | The actual content of the message |
| definition | Σ | 0..1 | canonical(MessageDefinition) | Link to the definition for this message |
| Documentation for this format | ||||