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This is an Implementation Guide for UK Core FHIR Assets in Development.
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StructureDefinition-UKCore-MessageHeader

Canonical_URL	Status	Current_Version	Last_Updated	Description
https://fhir.hl7.org.uk/StructureDefinition/UKCore-MessageHeader	draft	2.4.0	2023-12-12	This profile defines the UK constraints and extensions on the International FHIR resource MessageHeader.

Profile_Purpose
This profile carries the header data for a message exchange that is either requesting or responding to an action.

MessageHeader	I		MessageHeader	There are no (further) constraints on this element Element id MessageHeader Short description A resource that describes a message that is exchanged between systems Definition The header for a message exchange that is either requesting or responding to an action. The reference(s) that are the subject of the action as well as other information related to the action are typically transmitted in a bundle in which the MessageHeader resource instance is the first resource in the bundle. Data type MessageHeader Constraints dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources `contained.contained.empty()` dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()` dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource `contained.where((('#'+id in (%resource.descendants().reference \| %resource.descendants().as(canonical) \| %resource.descendants().as(uri) \| %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()` dom-6: A resource should have narrative for robust management text.`div`.exists() dom-5: If a resource is contained in another resource, it SHALL NOT have a security label `contained.meta.security.empty()` Mappings rim: Entity. Role, or Act v2: MSH / MSA / ERR rim: Message
id	Σ	0..1	string	There are no (further) constraints on this element Element id MessageHeader.id Short description Logical id of this artifact Definition The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes. Comments The only time that a resource does not have an id is when it is being submitted to the server using a create operation. Data type string
meta	Σ	0..1	Meta	There are no (further) constraints on this element Element id MessageHeader.meta Short description Metadata about the resource Definition The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource. Data type Meta Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A
implicitRules	Σ ?!	0..1	uri	There are no (further) constraints on this element Element id MessageHeader.implicitRules Short description A set of rules under which this content was created Definition A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc. Comments Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc. Data type uri Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
language		0..1	codeBinding	There are no (further) constraints on this element Element id MessageHeader.language Short description Language of the resource content Definition The base language in which the resource is written. Comments Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute). Data type code Binding A human language. CommonLanguages (preferred) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
text		0..1	Narrative	There are no (further) constraints on this element Element id MessageHeader.text Short description Text summary of the resource, for human interpretation Alternate names narrative, html, xhtml, display Definition A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety. Comments Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later. Data type Narrative Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A rim: Act.text?
contained		0..*	Resource	There are no (further) constraints on this element Element id MessageHeader.contained Short description Contained, inline Resources Alternate names inline resources, anonymous resources, contained resources Definition These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope. Comments This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels. Data type Resource Mappings rim: Entity. Role, or Act rim: N/A
extension	I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	?! I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.modifierExtension Short description Extensions that cannot be ignored Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
event[x]	S Σ	1..1		There are no (further) constraints on this element Element id MessageHeader.event[x] Short description Code for the event this message represents or link to event definition Definition Code that identifies the event this message represents and connects it with its definition. Events defined as part of the FHIR specification have the system value "http://terminology.hl7.org/CodeSystem/message-events". Alternatively uri to the EventDefinition. Requirements Drives the behavior associated with this message. Comments The time of the event will be found in the focus resource. The time of the message will be found in Bundle.timestamp. Binding One of the message events defined as part of this version of FHIR. MessageEvent (example) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a w5: FiveWs.what[x] v2: MSH-9.2 rim: ./payload[classCode="CACT" and moodCode="EVN" and isNormalAct()]/code[isNormalDatatype()]/code
eventCoding			Coding	There are no (further) constraints on this element Data type Coding
eventUri			uri	There are no (further) constraints on this element Data type uri
destination	S Σ	0..*	BackboneElement	There are no (further) constraints on this element Element id MessageHeader.destination Short description Message destination application(s) Definition The destination application which the message is intended for. Requirements Indicates where message is to be sent for routing purposes. Allows verification of "am I the intended recipient". Comments There SHOULD be at least one destination, but in some circumstances, the source system is unaware of any particular destination system. Data type BackboneElement Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a w5: FiveWs.subject[x] rim: ./communicationFunction[typeCode="RCV"] w5: FiveWs.subject
id		0..1	string	There are no (further) constraints on this element Element id MessageHeader.destination.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.destination.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	Σ ?! I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.destination.modifierExtension Short description Extensions that cannot be ignored even if unrecognized Alternate names extensions, user content, modifiers Definition May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
name	Σ	0..1	string	There are no (further) constraints on this element Element id MessageHeader.destination.name Short description Name of system Definition Human-readable name for the target system. Requirements May be used for routing of response and/or to support audit. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSH-5 rim: unique(./entity[determinerCode="INST" and (classCode=("DEV", "PSN", "ORG"]/name[type='ST' and isNormalDatatype()])
target	Σ I	0..1	Reference(Device)	There are no (further) constraints on this element Element id MessageHeader.destination.target Short description Particular delivery destination within the destination Definition Identifies the target end system in situations where the initial message transmission is to an intermediary system. Requirements Supports multi-hop routing. Comments References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc.). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository. Data type Reference(Device) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) rim: unique(./entity[determinerCode="INST" and (classCode=("DEV", "PSN", "ORG"]
endpoint	Σ	1..1	url	There are no (further) constraints on this element Element id MessageHeader.destination.endpoint Short description Actual destination address or id Definition Indicates where the message should be routed to. Requirements Identifies where to route the message. Comments The id may be a non-resolvable URI for systems that do not use standard network-based addresses. Data type url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSH-25 (or MSH-6) rim: ./telecom
receiver	Σ I	0..1	Reference(Practitioner \| PractitionerRole \| Organization)	There are no (further) constraints on this element Element id MessageHeader.destination.receiver Short description Intended "real-world" recipient for the data Definition Allows data conveyed by a message to be addressed to a particular person or department when routing to a specific application isn't sufficient. Requirements Allows routing beyond just the application level. Comments References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc.). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository. Data type Reference(Practitioner \| PractitionerRole \| Organization) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.subject[x] v2: PRT-5:PRT-4='WAYR' / PRT-8:PRT-4='WAYR' rim: Not directly supported. Could be shared using attentionLine.value with an appropriate keyWordText w5: FiveWs.subject
sender	S Σ I	0..1	Reference(Practitioner \| PractitionerRole \| Organization)	There are no (further) constraints on this element Element id MessageHeader.sender Short description Real world sender of the message Definition Identifies the sending system to allow the use of a trust relationship. Requirements Allows routing beyond just the application level. Comments Use case is for where a (trusted) sending system is responsible for multiple organizations, and therefore cannot differentiate based on source endpoint / authentication alone. Data type Reference(Practitioner \| PractitionerRole \| Organization) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.subject[x] v2: PRT-5:PRT-4='WAYR' / PRT-8:PRT-4='WAYR' rim: Not directly supported. Could be shared using attentionLine.value with an appropriate keyWordText w5: FiveWs.subject
enterer	Σ I	0..1	Reference(Practitioner \| PractitionerRole)	There are no (further) constraints on this element Element id MessageHeader.enterer Short description The source of the data entry Definition The person or device that performed the data entry leading to this message. When there is more than one candidate, pick the most proximal to the message. Can provide other enterers in extensions. Requirements Need to know for audit/traceback requirements and possibly for authorization. Comments Usually only for the request but can be used in a response. Data type Reference(Practitioner \| PractitionerRole) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.author v2: EVN-5 / ORC-10 / PRT-5:PRT-4='EP' / ROL where ROL.3 is EP or ORC.10 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[typeCode="ENT" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode=("DEV", "PSN") and determinerCode="INST"])
author	Σ I	0..1	Reference(Practitioner \| PractitionerRole)	There are no (further) constraints on this element Element id MessageHeader.author Short description The source of the decision Definition The logical author of the message - the person or device that decided the described event should happen. When there is more than one candidate, pick the most proximal to the MessageHeader. Can provide other authors in extensions. Requirements Need to know for audit/traceback requirements and possibly for authorization. Comments Usually only for the request but can be used in a response. Data type Reference(Practitioner \| PractitionerRole) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.author v2: ORC-19 / PRT-5:PRT-4='AUT' / ROL where ROL.3 is IP or ORC.12 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="AUT" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode=("DEV", "PSN") and determinerCode="INST"])
source	S Σ	1..1	BackboneElement	There are no (further) constraints on this element Element id MessageHeader.source Short description Message source application Definition The source application from which this message originated. Requirements Allows replies, supports audit. Data type BackboneElement Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a w5: FiveWs.actor rim: unique(./communicationFunction[typeCode="SND"])
id		0..1	string	There are no (further) constraints on this element Element id MessageHeader.source.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.source.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	Σ ?! I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.source.modifierExtension Short description Extensions that cannot be ignored even if unrecognized Alternate names extensions, user content, modifiers Definition May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
name	Σ	0..1	string	There are no (further) constraints on this element Element id MessageHeader.source.name Short description Name of system Definition Human-readable name for the source system. Requirements May be used to support audit. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSH-3 rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/name[type='ST' and isNormalDatatype()])
software	Σ	0..1	string	There are no (further) constraints on this element Element id MessageHeader.source.software Short description Name of software running the system Definition May include configuration or other information useful in debugging. Requirements Supports audit and possibly interface engine behavior. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: SFT-3 ( +SFT-1) rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/softwareName[isNormalDatatype()])
version	Σ	0..1	string	There are no (further) constraints on this element Element id MessageHeader.source.version Short description Version of software running Definition Can convey versions of multiple systems in situations where a message passes through multiple hands. Requirements Supports audit and possibly interface engine behavior. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: SFT-2 rim: (Not supported)
contact	Σ I	0..1	ContactPoint	There are no (further) constraints on this element Element id MessageHeader.source.contact Short description Human contact for problems Definition An e-mail, phone, website or other contact point to use to resolve issues with message communications. Requirements Allows escalation of technical issues. Data type ContactPoint Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` cpt-2: A system is required if a value is provided. `value.empty() or system.exists()` Mappings rim: n/a v2: XTN rim: TEL servd: ContactPoint v2: (MSH-22?) rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/scopesRole[normalRole() and classCode="CON" and layer[classCode="PSN"]/telecom[isNormalDatatype()])
endpoint	Σ	1..1	url	There are no (further) constraints on this element Element id MessageHeader.source.endpoint Short description Actual message source address or id Definition Identifies the routing target to send acknowledgements to. Requirements Identifies where to send responses, may influence security permissions. Comments The id may be a non-resolvable URI for systems that do not use standard network-based addresses. Data type url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSH-24 rim: ./telecom[isNormalDatatype()]
responsible	Σ I	0..1	Reference(Practitioner \| PractitionerRole \| Organization)	There are no (further) constraints on this element Element id MessageHeader.responsible Short description Final responsibility for event Definition The person or organization that accepts overall responsibility for the contents of the message. The implication is that the message event happened under the policies of the responsible party. Requirements Need to know for audit/traceback requirements and possibly for authorization. Comments Usually only for the request but can be used in a response. Data type Reference(Practitioner \| PractitionerRole \| Organization) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.witness v2: ORC-12 / PRT-5:PRT-4='OP' / PRT-8:PRT-4='OP' / ROL where ROL.3 is RO or ORC.11 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="RESP" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode="PSN" and determinerCode="INST"] or ./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="RESP" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/scoper[isNormalEntity() and classCode="ORG" and determinerCode="INST"])
reason	Σ	0..1	CodeableConcept	There are no (further) constraints on this element Element id MessageHeader.reason Short description Cause of event Definition Coded indication of the cause for the event - indicates a reason for the occurrence of the event that is a focus of this message. Requirements Need to be able to track why resources are being changed and report in the audit log/history of the resource. May affect authorization. Comments Not all terminology uses fit this general pattern. In some cases, models should not use CodeableConcept and use Coding directly and provide their own structure for managing text, codings, translations and the relationship between elements and pre- and post-coordination. Data type CodeableConcept Binding Reason for event occurrence. ExampleMessageReasonCodes (example) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: CE/CNE/CWE rim: CD orim: fhir:CodeableConcept rdfs:subClassOf dt:CD w5: FiveWs.why[x] v2: EVN.4 / ORC.16 / OBR-31-reason for study / BPO-13-BP indication for use / RXO-20-indication / RXE-27-give indication / RXD-21-indication / RXG-22-indication / RXA-19-indication rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/reasonCode[isNormalDatatype()])
response	Σ	0..1	BackboneElement	There are no (further) constraints on this element Element id MessageHeader.response Short description If this is a reply to prior message Definition Information about the message that this message is a response to. Only present if this message is a response. Data type BackboneElement Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSA rim: ./conveyedAcknowledgement
id		0..1	string	There are no (further) constraints on this element Element id MessageHeader.response.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.response.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	Σ ?! I	0..*	Extension	There are no (further) constraints on this element Element id MessageHeader.response.modifierExtension Short description Extensions that cannot be ignored even if unrecognized Alternate names extensions, user content, modifiers Definition May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. Comments There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. Data type Extension Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
identifier	Σ	1..1	id	There are no (further) constraints on this element Element id MessageHeader.response.identifier Short description Id of original message Definition The MessageHeader.id of the message to which this message is a response. Requirements Allows receiver to know what message is being responded to. Comments RFC 4122 Data type id Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSA-2 rim: ./acknowledges.id[isNormalDatatype()]
code	Σ	1..1	codeBinding	There are no (further) constraints on this element Element id MessageHeader.response.code Short description ok \| transient-error \| fatal-error Definition Code that identifies the type of response to the message - whether it was successful or not, and whether it should be resent or not. Requirements Allows the sender of the acknowledge message to know if the request was successful or if action is needed. Comments This is a generic response to the request message. Specific data for the response will be found in MessageHeader.focus. Data type code Binding The kind of response to a message. ResponseType (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: MSA-1 rim: ./typeCode[isNormalDatatype()]
details	Σ I	0..1	Reference(OperationOutcome)	There are no (further) constraints on this element Element id MessageHeader.response.details Short description Specific list of hints/warnings/errors Definition Full details of any issues found in the message. Requirements Allows the sender of the message to determine what the specific issues are. Comments This SHALL be contained in the bundle. If any of the issues are errors, the response code SHALL be an error. Data type Reference(OperationOutcome) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) v2: ERR rim: AcknowledgementDetail or Observation[classCode="ALRT" and moodCode="EVN"]
focus	S Σ I	0..*	Reference(Resource)	There are no (further) constraints on this element Element id MessageHeader.focus Short description The actual content of the message Definition The actual data of the message - a reference to the root/focus class of the event. Requirements Every message event is about actual data, a single resource, that is identified in the definition of the event, and perhaps some or all linked resources. Comments The data is defined where the transaction type is defined. The transaction data is always included in the bundle that is the full message. Only the root resource is specified. The resources it references should be contained in the bundle but are not also listed here. Multiple repetitions are allowed to cater for merges and other situations with multiple focal targets. Data type Reference(Resource) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))` Mappings rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[typeCode="SUBJ" and isNormalParticipation]/role or ./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/outboundRelationship[typeCode="SBJ" and isNormalActRelatoinship]/target)
definition	Σ	0..1	canonical(MessageDefinition)	There are no (further) constraints on this element Element id MessageHeader.definition Short description Link to the definition for this message Definition Permanent link to the MessageDefinition for this message. Requirements Allows sender to define the expected contents of the message. Comments see Canonical References Data type canonical(MessageDefinition) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: Not directly supported.

Detailed Descriptions

MessageHeader
Definition	The header for a message exchange that is either requesting or responding to an action. The reference(s) that are the subject of the action as well as other information related to the action are typically transmitted in a bundle in which the MessageHeader resource instance is the first resource in the bundle.
Cardinality	0...*
Invariants	dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources `contained.contained.empty()` dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()` dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource `contained.where((('#'+id in (%resource.descendants().reference \| %resource.descendants().as(canonical) \| %resource.descendants().as(uri) \| %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()` dom-6: A resource should have narrative for robust management text.`div`.exists() dom-5: If a resource is contained in another resource, it SHALL NOT have a security label `contained.meta.security.empty()`
Mappings	rim: Entity. Role, or Act v2: MSH / MSA / ERR rim: Message
MessageHeader.id
Definition	The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.
Cardinality	0...1
Type	string
Summary	True
Comments	The only time that a resource does not have an id is when it is being submitted to the server using a create operation.
MessageHeader.meta
Definition	The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource.
Cardinality	0...1
Type	Meta
Summary	True
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a rim: N/A
MessageHeader.implicitRules
Definition	A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.
Cardinality	0...1
Type	uri
Modifier	True
Summary	True
Comments	Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a
MessageHeader.language
Definition	The base language in which the resource is written.
Cardinality	0...1
Type	code
Binding	A human language. CommonLanguages (preferred)
Comments	Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a
MessageHeader.text
Definition	A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.
Cardinality	0...1
Type	Narrative
Alias	narrative, html, xhtml, display
Comments	Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a rim: N/A rim: Act.text?
MessageHeader.contained
Definition	These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.
Cardinality	0...*
Type	Resource
Alias	inline resources, anonymous resources, contained resources
Comments	This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels.
Mappings	rim: Entity. Role, or Act rim: N/A
MessageHeader.extension
Definition	May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Cardinality	0...*
Type	Extension
Alias	extensions, user content
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	Unordered, Open, by url(Value)
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Cardinality	0...*
Type	Extension
Modifier	True
Alias	extensions, user content
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	Unordered, Open, by url(Value)
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.event[x]
Definition	Code that identifies the event this message represents and connects it with its definition. Events defined as part of the FHIR specification have the system value "http://terminology.hl7.org/CodeSystem/message-events". Alternatively uri to the EventDefinition.
Cardinality	1...1
Type	Coding
Binding	One of the message events defined as part of this version of FHIR. MessageEvent (example)
Must Support	True
Summary	True
Requirements	Drives the behavior associated with this message.
Comments	The time of the event will be found in the focus resource. The time of the message will be found in Bundle.timestamp.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a w5: FiveWs.what[x] v2: MSH-9.2 rim: ./payload[classCode="CACT" and moodCode="EVN" and isNormalAct()]/code[isNormalDatatype()]/code
MessageHeader.destination
Definition	The destination application which the message is intended for.
Cardinality	0...*
Type	BackboneElement
Must Support	True
Summary	True
Requirements	Indicates where message is to be sent for routing purposes. Allows verification of "am I the intended recipient".
Comments	There SHOULD be at least one destination, but in some circumstances, the source system is unaware of any particular destination system.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a w5: FiveWs.subject[x] rim: ./communicationFunction[typeCode="RCV"] w5: FiveWs.subject
MessageHeader.destination.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Cardinality	0...1
Type	string
Mappings	rim: n/a
MessageHeader.destination.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Cardinality	0...*
Type	Extension
Alias	extensions, user content
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	Unordered, Open, by url(Value)
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.destination.modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Cardinality	0...*
Type	Extension
Modifier	True
Summary	True
Alias	extensions, user content, modifiers
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.destination.name
Definition	Human-readable name for the target system.
Cardinality	0...1
Type	string
Summary	True
Requirements	May be used for routing of response and/or to support audit.
Comments	Note that FHIR strings SHALL NOT exceed 1MB in size
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSH-5 rim: unique(./entity[determinerCode="INST" and (classCode=("DEV", "PSN", "ORG"]/name[type='ST' and isNormalDatatype()])
MessageHeader.destination.target
Definition	Identifies the target end system in situations where the initial message transmission is to an intermediary system.
Cardinality	0...1
Type	Reference(Device)
Summary	True
Requirements	Supports multi-hop routing.
Comments	References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc.). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) rim: unique(./entity[determinerCode="INST" and (classCode=("DEV", "PSN", "ORG"]
MessageHeader.destination.endpoint
Definition	Indicates where the message should be routed to.
Cardinality	1...1
Type	url
Summary	True
Requirements	Identifies where to route the message.
Comments	The id may be a non-resolvable URI for systems that do not use standard network-based addresses.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSH-25 (or MSH-6) rim: ./telecom
MessageHeader.destination.receiver
Definition	Allows data conveyed by a message to be addressed to a particular person or department when routing to a specific application isn't sufficient.
Cardinality	0...1
Type	Reference(Practitioner \| PractitionerRole \| Organization)
Summary	True
Requirements	Allows routing beyond just the application level.
Comments	References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc.). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.subject[x] v2: PRT-5:PRT-4='WAYR' / PRT-8:PRT-4='WAYR' rim: Not directly supported. Could be shared using attentionLine.value with an appropriate keyWordText w5: FiveWs.subject
MessageHeader.sender
Definition	Identifies the sending system to allow the use of a trust relationship.
Cardinality	0...1
Type	Reference(Practitioner \| PractitionerRole \| Organization)
Must Support	True
Summary	True
Requirements	Allows routing beyond just the application level.
Comments	Use case is for where a (trusted) sending system is responsible for multiple organizations, and therefore cannot differentiate based on source endpoint / authentication alone.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.subject[x] v2: PRT-5:PRT-4='WAYR' / PRT-8:PRT-4='WAYR' rim: Not directly supported. Could be shared using attentionLine.value with an appropriate keyWordText w5: FiveWs.subject
MessageHeader.enterer
Definition	The person or device that performed the data entry leading to this message. When there is more than one candidate, pick the most proximal to the message. Can provide other enterers in extensions.
Cardinality	0...1
Type	Reference(Practitioner \| PractitionerRole)
Summary	True
Requirements	Need to know for audit/traceback requirements and possibly for authorization.
Comments	Usually only for the request but can be used in a response.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.author v2: EVN-5 / ORC-10 / PRT-5:PRT-4='EP' / ROL where ROL.3 is EP or ORC.10 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[typeCode="ENT" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode=("DEV", "PSN") and determinerCode="INST"])
MessageHeader.author
Definition	The logical author of the message - the person or device that decided the described event should happen. When there is more than one candidate, pick the most proximal to the MessageHeader. Can provide other authors in extensions.
Cardinality	0...1
Type	Reference(Practitioner \| PractitionerRole)
Summary	True
Requirements	Need to know for audit/traceback requirements and possibly for authorization.
Comments	Usually only for the request but can be used in a response.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.author v2: ORC-19 / PRT-5:PRT-4='AUT' / ROL where ROL.3 is IP or ORC.12 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="AUT" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode=("DEV", "PSN") and determinerCode="INST"])
MessageHeader.source
Definition	The source application from which this message originated.
Cardinality	1...1
Type	BackboneElement
Must Support	True
Summary	True
Requirements	Allows replies, supports audit.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a w5: FiveWs.actor rim: unique(./communicationFunction[typeCode="SND"])
MessageHeader.source.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Cardinality	0...1
Type	string
Mappings	rim: n/a
MessageHeader.source.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Cardinality	0...*
Type	Extension
Alias	extensions, user content
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	Unordered, Open, by url(Value)
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.source.modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Cardinality	0...*
Type	Extension
Modifier	True
Summary	True
Alias	extensions, user content, modifiers
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.source.name
Definition	Human-readable name for the source system.
Cardinality	0...1
Type	string
Summary	True
Requirements	May be used to support audit.
Comments	Note that FHIR strings SHALL NOT exceed 1MB in size
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSH-3 rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/name[type='ST' and isNormalDatatype()])
MessageHeader.source.software
Definition	May include configuration or other information useful in debugging.
Cardinality	0...1
Type	string
Summary	True
Requirements	Supports audit and possibly interface engine behavior.
Comments	Note that FHIR strings SHALL NOT exceed 1MB in size
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: SFT-3 ( +SFT-1) rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/softwareName[isNormalDatatype()])
MessageHeader.source.version
Definition	Can convey versions of multiple systems in situations where a message passes through multiple hands.
Cardinality	0...1
Type	string
Summary	True
Requirements	Supports audit and possibly interface engine behavior.
Comments	Note that FHIR strings SHALL NOT exceed 1MB in size
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: SFT-2 rim: (Not supported)
MessageHeader.source.contact
Definition	An e-mail, phone, website or other contact point to use to resolve issues with message communications.
Cardinality	0...1
Type	ContactPoint
Summary	True
Requirements	Allows escalation of technical issues.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` cpt-2: A system is required if a value is provided. `value.empty() or system.exists()`
Mappings	rim: n/a v2: XTN rim: TEL servd: ContactPoint v2: (MSH-22?) rim: unique(./entity[determinerCode="INST" and classCode="DEV"]/scopesRole[normalRole() and classCode="CON" and layer[classCode="PSN"]/telecom[isNormalDatatype()])
MessageHeader.source.endpoint
Definition	Identifies the routing target to send acknowledgements to.
Cardinality	1...1
Type	url
Summary	True
Requirements	Identifies where to send responses, may influence security permissions.
Comments	The id may be a non-resolvable URI for systems that do not use standard network-based addresses.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSH-24 rim: ./telecom[isNormalDatatype()]
MessageHeader.responsible
Definition	The person or organization that accepts overall responsibility for the contents of the message. The implication is that the message event happened under the policies of the responsible party.
Cardinality	0...1
Type	Reference(Practitioner \| PractitionerRole \| Organization)
Summary	True
Requirements	Need to know for audit/traceback requirements and possibly for authorization.
Comments	Usually only for the request but can be used in a response.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) w5: FiveWs.witness v2: ORC-12 / PRT-5:PRT-4='OP' / PRT-8:PRT-4='OP' / ROL where ROL.3 is RO or ORC.11 rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="RESP" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/player[isNormalEntity() and classCode="PSN" and determinerCode="INST"] or ./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[isHighest(priorityCode) and typeCode="RESP" and isNormalParticipation]/role[classCode="ASSIGNED" and isNormalRole()]/scoper[isNormalEntity() and classCode="ORG" and determinerCode="INST"])
MessageHeader.reason
Definition	Coded indication of the cause for the event - indicates a reason for the occurrence of the event that is a focus of this message.
Cardinality	0...1
Type	CodeableConcept
Binding	Reason for event occurrence. ExampleMessageReasonCodes (example)
Summary	True
Requirements	Need to be able to track why resources are being changed and report in the audit log/history of the resource. May affect authorization.
Comments	Not all terminology uses fit this general pattern. In some cases, models should not use CodeableConcept and use Coding directly and provide their own structure for managing text, codings, translations and the relationship between elements and pre- and post-coordination.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: CE/CNE/CWE rim: CD orim: fhir:CodeableConcept rdfs:subClassOf dt:CD w5: FiveWs.why[x] v2: EVN.4 / ORC.16 / OBR-31-reason for study / BPO-13-BP indication for use / RXO-20-indication / RXE-27-give indication / RXD-21-indication / RXG-22-indication / RXA-19-indication rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/reasonCode[isNormalDatatype()])
MessageHeader.response
Definition	Information about the message that this message is a response to. Only present if this message is a response.
Cardinality	0...1
Type	BackboneElement
Summary	True
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSA rim: ./conveyedAcknowledgement
MessageHeader.response.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Cardinality	0...1
Type	string
Mappings	rim: n/a
MessageHeader.response.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Cardinality	0...*
Type	Extension
Alias	extensions, user content
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	Unordered, Open, by url(Value)
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.response.modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Cardinality	0...*
Type	Extension
Modifier	True
Summary	True
Alias	extensions, user content, modifiers
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()`
Mappings	rim: n/a rim: N/A
MessageHeader.response.identifier
Definition	The MessageHeader.id of the message to which this message is a response.
Cardinality	1...1
Type	id
Summary	True
Requirements	Allows receiver to know what message is being responded to.
Comments	RFC 4122
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSA-2 rim: ./acknowledges.id[isNormalDatatype()]
MessageHeader.response.code
Definition	Code that identifies the type of response to the message - whether it was successful or not, and whether it should be resent or not.
Cardinality	1...1
Type	code
Binding	The kind of response to a message. ResponseType (required)
Summary	True
Requirements	Allows the sender of the acknowledge message to know if the request was successful or if action is needed.
Comments	This is a generic response to the request message. Specific data for the response will be found in MessageHeader.focus.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a v2: MSA-1 rim: ./typeCode[isNormalDatatype()]
MessageHeader.response.details
Definition	Full details of any issues found in the message.
Cardinality	0...1
Type	Reference(OperationOutcome)
Summary	True
Requirements	Allows the sender of the message to determine what the specific issues are.
Comments	This SHALL be contained in the bundle. If any of the issues are errors, the response code SHALL be an error.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) v2: ERR rim: AcknowledgementDetail or Observation[classCode="ALRT" and moodCode="EVN"]
MessageHeader.focus
Definition	The actual data of the message - a reference to the root/focus class of the event.
Cardinality	0...*
Type	Reference(Resource)
Must Support	True
Summary	True
Requirements	Every message event is about actual data, a single resource, that is identified in the definition of the event, and perhaps some or all linked resources.
Comments	The data is defined where the transaction type is defined. The transaction data is always included in the bundle that is the full message. Only the root resource is specified. The resources it references should be contained in the bundle but are not also listed here. Multiple repetitions are allowed to cater for merges and other situations with multiple focal targets.
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ref-1: SHALL have a contained resource if a local reference is provided `reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))`
Mappings	rim: n/a rim: The target of a resource reference is a RIM entry point (Act, Role, or Entity) rim: unique(./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/participation[typeCode="SUBJ" and isNormalParticipation]/role or ./controlAct[classCode="CACT" and classCode="EVN" and isNormalAct()]/outboundRelationship[typeCode="SBJ" and isNormalActRelatoinship]/target)
MessageHeader.definition
Definition	Permanent link to the MessageDefinition for this message.
Cardinality	0...1
Type	canonical(MessageDefinition)
Summary	True
Requirements	Allows sender to define the expected contents of the message.
Comments	see Canonical References
Invariants	ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())`
Mappings	rim: n/a rim: Not directly supported.

Table View

MessageHeader		..
MessageHeader.event[x]		..
MessageHeader.destination		..
MessageHeader.sender		..
MessageHeader.source		..
MessageHeader.focus		..

XML View

<StructureDefinition xmlns="http://hl7.org/fhir">
    <id value="UKCore-MessageHeader" />
    <url value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-MessageHeader" />
    <version value="2.4.0" />
    <name value="UKCoreMessageHeader" />
    <title value="UK Core MessageHeader" />
    <status value="draft" />
    <date value="2023-12-12" />
    <publisher value="HL7 UK" />
    <contact>
        <name value="HL7 UK" />
        <telecom>
            <system value="email" />
            <value value="ukcore@hl7.org.uk" />
            <use value="work" />
            <rank value="1" />
        </telecom>
    </contact>
    <description value="This profile defines the UK constraints and extensions on the International FHIR resource [MessageHeader](https://hl7.org/fhir/R4/MessageHeader.html)." />
    <purpose value="This profile carries the header data for a message exchange that is either requesting or responding to an action." />
    <copyright value="Copyright &#169; 2021+ HL7 UK Licensed under the Apache License, Version 2.0 (the &quot;License&quot;); you may not use this file except in compliance with the License. You may obtain a copy of the License at  http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. HL7&#174; FHIR&#174; standard Copyright &#169; 2011+ HL7 The HL7&#174; FHIR&#174; standard is used under the FHIR license. You may obtain a copy of the FHIR license at  https://www.hl7.org/fhir/license.html." />
    <fhirVersion value="4.0.1" />
    <kind value="resource" />
    <abstract value="false" />
    <type value="MessageHeader" />
    <baseDefinition value="http://hl7.org/fhir/StructureDefinition/MessageHeader" />
    <derivation value="constraint" />
    <differential>
        <element id="MessageHeader.event[x]">
            <path value="MessageHeader.event[x]" />
            <mustSupport value="true" />
        </element>
        <element id="MessageHeader.destination">
            <path value="MessageHeader.destination" />
            <mustSupport value="true" />
        </element>
        <element id="MessageHeader.sender">
            <path value="MessageHeader.sender" />
            <mustSupport value="true" />
        </element>
        <element id="MessageHeader.source">
            <path value="MessageHeader.source" />
            <mustSupport value="true" />
        </element>
        <element id="MessageHeader.focus">
            <path value="MessageHeader.focus" />
            <mustSupport value="true" />
        </element>
    </differential>
</StructureDefinition>

JSON View

{
    "resourceType": "StructureDefinition",
    "id": "UKCore-MessageHeader",
    "url": "https://fhir.hl7.org.uk/StructureDefinition/UKCore-MessageHeader",
    "version": "2.4.0",
    "name": "UKCoreMessageHeader",
    "title": "UK Core MessageHeader",
    "status": "draft",
    "date": "2023-12-12",
    "publisher": "HL7 UK",
    "contact":  [
        {
            "name": "HL7 UK",
            "telecom":  [
                {
                    "system": "email",
                    "value": "ukcore@hl7.org.uk",
                    "use": "work",
                    "rank": 1
                }
            ]
        }
    ],
    "description": "This profile defines the UK constraints and extensions on the International FHIR resource [MessageHeader](https://hl7.org/fhir/R4/MessageHeader.html).",
    "purpose": "This profile carries the header data for a message exchange that is either requesting or responding to an action.",
    "copyright": "Copyright © 2021+ HL7 UK Licensed under the Apache License, Version 2.0 (the \"License\"); you may not use this file except in compliance with the License. You may obtain a copy of the License at  http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. HL7® FHIR® standard Copyright © 2011+ HL7 The HL7® FHIR® standard is used under the FHIR license. You may obtain a copy of the FHIR license at  https://www.hl7.org/fhir/license.html.",
    "fhirVersion": "4.0.1",
    "kind": "resource",
    "abstract": false,
    "type": "MessageHeader",
    "baseDefinition": "http://hl7.org/fhir/StructureDefinition/MessageHeader",
    "derivation": "constraint",
    "differential": {
        "element":  [
            {
                "id": "MessageHeader.event[x]",
                "path": "MessageHeader.event[x]",
                "mustSupport": true
            },
            {
                "id": "MessageHeader.destination",
                "path": "MessageHeader.destination",
                "mustSupport": true
            },
            {
                "id": "MessageHeader.sender",
                "path": "MessageHeader.sender",
                "mustSupport": true
            },
            {
                "id": "MessageHeader.source",
                "path": "MessageHeader.source",
                "mustSupport": true
            },
            {
                "id": "MessageHeader.focus",
                "path": "MessageHeader.focus",
                "mustSupport": true
            }
        ]
    }
}

Usage

This Profile has the following derived profiles:

This Profile is referenced in the following Extensions:

This Profile is referenced in the following Profiles:

Feedback

Click here to:

Report issue for UKCore-MessageHeader

Examples

Discharge Summary - An example to illustrate a message header for a discharge summary
Example UKCore-MessageHeader-Discharge

Example Usage Scenarios

The following are feasible use cases for the UK Core OperationOutcome profile:

Query for
Exchange of

Profile Specific Implementation Guidance:

Minimum Viable Content

A minimum viable content that all provider and consumer systems SHALL support are the following elements.

Element	Reason
`MessageHeader.event[x]`	Code for the event this message represents or link to event definition
`MessageHeader.destination`	The destination application which the message is intended for.
`MessageHeader.sender`	Real world sender of the message
`MessageHeader.source`	The source application from which this message originated.
`MessageHeader.focus`	The actual content of the message

Extensions

More information about the extensions can be found using the links below.

Important note regarding the extension `messageheader-response-request`.

This extension is defined in the FHIR R4 specification as having a root conformance of 1..1 which mandates the use of the extension if added to any profile. This is an error and has been amended in R5 but will not be updated in R4. Therefore this extension is not hardcoded in the profile as this is not the desired behaviour.

Extension	Context	Link	Comment
messageheader-response-request	MessageHeader	Core-defined Extension messageheader-response-request	This is a HL7 Core-defined extension that is used to indicate the response required to a message.

Bindings (differential)

More information about the bindings to UK Core ValueSets can be found below.

Context	Strength	Link
MessageHeader.event	Example	ValueSet UKCore-MessageEvent

`destination`

The resource referenced in MessageHeader.destination.target SHOULD conform to the Profile UKCore-Device.

The resource referenced in MessageHeader.destination.receiver SHOULD conform to one of the following:

`sender`

Where possible, it is expected that the resource being referenced SHOULD conform to one of the following UK Core profiles:

`enterer`

Where possible, it is expected that the resource being referenced SHOULD conform to one of the following UK Core profiles:

`author`

Where possible, it is expected that the resource being referenced SHOULD conform to one of the following UK Core profiles:

`responsible`

Where possible, it is expected that the resource being referenced SHOULD conform to one of the following UK Core profiles:

`response`

The resource referenced in MessageHeader.response.details SHOULD conform to the Profile UKCore-OperationOutcome

`focus`

Where a UK Core profile exists the resource being referenced SHOULD conform to the profile.

StructureDefinition-UKCore-MessageHeader

Detailed Descriptions

Table View

XML View

JSON View

Usage

Feedback

Examples

Example Usage Scenarios

Profile Specific Implementation Guidance:

Minimum Viable Content

Extensions

Important note regarding the extension messageheader-response-request.

Bindings (differential)

destination

sender

enterer

author

responsible

response

focus

Important note regarding the extension `messageheader-response-request`.

`destination`

`sender`

`enterer`

`author`

`responsible`

`response`

`focus`