Name	Flags	Card.	Type	Description & Constraints
MessageDefinition	I TU		DomainResource	A resource that defines a type of message that can be exchanged between systems + Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension
url	Σ	0..1	uri	Business Identifier for a given MessageDefinition
identifier	Σ	0..*	Identifier	Primary key for the message definition on a given server
version	Σ	0..1	string	Business version of the message definition
name	Σ I	0..1	string	Name for this message definition (computer friendly)
title	Σ	0..1	string	Name for this message definition (human friendly)
replaces	Σ	0..*	canonical( MessageDefinition)	Takes the place of
status	?! Σ	1..1	code	draft | active | retired | unknown PublicationStatus ( Required)
experimental	Σ	0..1	boolean	For testing purposes, not real usage
date	Σ	1..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description	Σ	0..1	markdown	Natural language description of the message definition
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
jurisdiction	Σ	0..*	CodeableConcept	Intended jurisdiction for message definition (if applicable) Jurisdiction ( Extensible)
purpose	Σ	0..1	markdown	Why this message definition is defined
copyright		0..1	markdown	Use and/or publishing restrictions
base	Σ	0..1	canonical( MessageDefinition)	Definition this one is based on
parent	Σ	0..*	canonical( ActivityDefinition | PlanDefinition)	Protocol/workflow this is part of
event[x]	Σ	1..1		Event code or link to the EventDefinition MessageEvent ( Example)
eventCoding			Coding
eventUri			uri
category	Σ	0..1	code	consequence | currency | notification MessageSignificanceCategory ( Required)
focus	Σ I	0..*	BackboneElement	Resource(s) that are the subject of the event + Rule: Max must be postive int or *
code	Σ	1..1	code	Type of resource ResourceType ( Required)
profile		0..1	canonical( StructureDefinition)	Profile that must be adhered to by focus
min	Σ	1..1	unsignedInt	Minimum number of focuses of this type
max	I	0..1	string	Maximum number of focuses of this type
responseRequired		0..1	code	always | on-error | never | on-success messageheader-response-request ( Required)
allowedResponse		0..*	BackboneElement	Responses to this message
message		1..1	canonical( MessageDefinition)	Reference to allowed message definition response
situation		0..1	markdown	When should this response be used
graph		0..*	canonical( GraphDefinition)	Canonical URL for a GraphDefinition
Documentation for this format