Name	Flags	Card.	Type	Description & Constraints
MessageHeader	Σ 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		Code for the event this message represents or link to event definition MessageEvent ( Example )
eventCoding			Coding
eventUri			uri
destination	Σ	0..*	BackboneElement	Message destination application(s)
name	Σ	0..1	string	Name of system
target	Σ	0..1	Reference ( Device )	Particular delivery destination within the destination
endpoint	Σ	1..1	url	Actual destination address or id
receiver	Σ	0..1	Reference ( Practitioner | PractitionerRole | Organization )	Intended "real-world" recipient for the data
sender	Σ	0..1	Reference ( Practitioner | PractitionerRole | Organization )	Real world sender of the message
enterer	Σ	0..1	Reference ( Practitioner | PractitionerRole )	The source of the data entry
author	Σ	0..1	Reference ( Practitioner | PractitionerRole )	The source of the decision
source	Σ	1..1	BackboneElement	Message source application
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
endpoint	Σ	1..1	url	Actual message source address or id
responsible	Σ	0..1	Reference ( Practitioner | PractitionerRole | Organization )	Final responsibility for event
reason	Σ	0..1	CodeableConcept	Cause of event Example Message Reason Codes ( Example )
response	Σ	0..1	BackboneElement	If this is a reply to prior message
identifier	Σ	1..1	id	Id of original message
code	Σ	1..1	code	ok | transient-error | fatal-error ResponseType ( 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