Medtech ALEX® AU Implementation Guide
1.0.0 - Trial Use

Medtech ALEX® AU Implementation Guide - Local Development build (v1.0.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

## Resource Profile: Communication

Official URL: https://alexapi.medtechglobal.com.au/fhir/StructureDefinition/alex-communication | Version: 1.0.0
Active as of 2026-01-12 | Computable Name: AlexCommunication

The ALEX Communication

Usages:

- Derived from this Profile: Outbox
- Use this Profile: Communication Bundle

You can also check for usages in the FHIR IG Statistics

### Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

- Key Elements Table
- Differential Table
- Snapshot Table
- Statistics/References
- All

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | S Σ | 0..1 | Identifier | Unique identifier
use | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
value | S Σ | 0..1 | string | The value that is unique Example General: 123456
status | ?!S Σ | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown Binding: EventStatus (required): The status of the communication.
category | S | 1..1 | CodeableConcept | Message category Binding: CommunicationCategory (example): Codes for general categories of communications such as alerts, instructions, etc.
coding | S Σ | 1..1 | Coding | Code defined by a terminology system
system | S Σ | 1..1 | uri | Identity of the terminology system
code | S Σ | 1..1 | code | Symbol in syntax defined by the system
subject | S Σ | 1..1 | Reference(Patient | Group) | Focus of message
display | Σ | 0..1 | string | External name of patient
sent | S | 1..1 | dateTime | When sent
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
payload | S | 1..1 | BackboneElement | Message payload
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
Slices for content[x] |  | 1..1 |  | Message part content Slice: Unordered, Open by type:$this
contentString |  |  | string |
contentAttachment |  |  | Attachment |
contentReference |  |  | Reference(Resource) |
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
contentType | S Σ | 1..1 | code | Mime type of the content, with charset etc. Binding: Mime Types (required): The mime type of an attachment. Any valid mime type is allowed. Example General: text/plain; charset=UTF-8, image/png
data | S | 1..1 | base64Binary | Data inline, base64ed
title | S Σ | 1..1 | string | Label to display in place of the data Example General: Official Corporate Logo
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Communication.identifier.​use | Base | required | IdentifierUse | 📍4.0.1 | FHIR Std.
Communication.status | Base | required | EventStatus | 📍4.0.1 | FHIR Std.
Communication.category | Base | example | CommunicationCategory | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​contentType | Base | required | MimeType | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | Communication | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | Communication | 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-4 | error | Communication | 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-5 | error | Communication | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | Communication | A resource should have narrative for robust management | `text.`div`.exists()`
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

This structure is derived from Communication

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
extension |  | 0..0 |  | Extension
identifier | S | 0..1 | Identifier | Unique identifier
value | S | 0..1 | string | The value that is unique
instantiatesCanonical |  | 0..0 |  | Instantiates FHIR protocol or definition
basedOn |  | 0..0 |  | Request fulfilled by this communication
partOf |  | 0..0 |  | Part of this action
inResponseTo |  | 0..0 |  | Reply to
status | S | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown
statusReason |  | 0..0 |  | Reason for current status
category | S | 1..1 | CodeableConcept | Message category
coding | S | 1..1 | Coding | Code defined by a terminology system
system | S | 1..1 | uri | Identity of the terminology system
code | S | 1..1 | code | Symbol in syntax defined by the system
priority |  | 0..0 |  | routine | urgent | asap | stat
medium |  | 0..0 |  | A channel of communication
subject | S | 1..1 | Reference(Patient | Group) | Focus of message
display |  | 0..1 | string | External name of patient
topic |  | 0..0 |  | Description of the purpose/content
about |  | 0..0 |  | Resources that pertain to this communication
encounter |  | 0..0 |  | Encounter created as part of
sent | S | 1..1 | dateTime | When sent
received |  | 0..0 |  | When received
recipient |  | 0..0 |  | Message recipient
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
reasonCode |  | 0..0 |  | Indication for message
reasonReference |  | 0..0 |  | Why was communication done?
payload | S | 1..1 | BackboneElement | Message payload
Slices for content[x] |  | 1..1 | string, Attachment, Reference(Resource) | Message part content Slice: Unordered, Open by type:$this
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
contentType | S | 1..1 | code | Mime type of the content, with charset etc.
data | S | 1..1 | base64Binary | Data inline, base64ed
title | S | 1..1 | string | Label to display in place of the data
note |  | 0..0 |  | Comments made about the communication
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
id | Σ | 0..1 | id | Logical id of this artifact
meta | Σ | 0..1 | Meta | Metadata about the resource
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
language |  | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
text |  | 0..1 | Narrative | Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained |  | 0..* | Resource | Contained, inline Resources
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | S Σ | 0..1 | Identifier | Unique identifier
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
use | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type | Σ | 0..1 | CodeableConcept | Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system | Σ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value | S Σ | 0..1 | string | The value that is unique Example General: 123456
period | Σ | 0..1 | Period | Time period when id is/was valid for use
assigner | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text)
instantiatesUri | Σ | 0..* | uri | Instantiates external protocol or definition
status | ?!S Σ | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown Binding: EventStatus (required): The status of the communication.
category | S | 1..1 | CodeableConcept | Message category Binding: CommunicationCategory (example): Codes for general categories of communications such as alerts, instructions, etc.
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
coding | S Σ | 1..1 | Coding | Code defined by a terminology system
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
system | S Σ | 1..1 | uri | Identity of the terminology system
version | Σ | 0..1 | string | Version of the system - if relevant
code | S Σ | 1..1 | code | Symbol in syntax defined by the system
display | Σ | 0..1 | string | Representation defined by the system
userSelected | Σ | 0..1 | boolean | If this coding was chosen directly by the user
text | Σ | 0..1 | string | Plain text representation of the concept
subject | S Σ | 1..1 | Reference(Patient | Group) | Focus of message
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
reference | Σ C | 0..1 | string | Literal reference, Relative, internal or absolute URL
type | Σ | 0..1 | uri | Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model).
identifier | Σ | 0..1 | Identifier | Logical reference, when literal reference is not known
display | Σ | 0..1 | string | External name of patient
sent | S | 1..1 | dateTime | When sent
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
payload | S | 1..1 | BackboneElement | Message payload
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
Slices for content[x] |  | 1..1 |  | Message part content Slice: Unordered, Open by type:$this
contentString |  |  | string |
contentAttachment |  |  | Attachment |
contentReference |  |  | Reference(Resource) |
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
contentType | S Σ | 1..1 | code | Mime type of the content, with charset etc. Binding: Mime Types (required): The mime type of an attachment. Any valid mime type is allowed. Example General: text/plain; charset=UTF-8, image/png
language | Σ | 0..1 | code | Human language of the content (BCP-47) Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
Example General: en-AU
data | S | 1..1 | base64Binary | Data inline, base64ed
url | Σ | 0..1 | url | Uri where the data can be found Example General: http://www.acme.com/logo-small.png
size | Σ | 0..1 | unsignedInt | Number of bytes of content (if url provided)
hash | Σ | 0..1 | base64Binary | Hash of the data (sha-1, base64ed)
title | S Σ | 1..1 | string | Label to display in place of the data Example General: Official Corporate Logo
creation | Σ | 0..1 | dateTime | Date attachment was first created
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Communication.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
Communication.identifier.​use | Base | required | IdentifierUse | 📍4.0.1 | FHIR Std.
Communication.identifier.​type | Base | extensible | IdentifierType | 📍4.0.1 | FHIR Std.
Communication.status | Base | required | EventStatus | 📍4.0.1 | FHIR Std.
Communication.category | Base | example | CommunicationCategory | 📍4.0.1 | FHIR Std.
Communication.subject.​type | Base | extensible | ResourceType | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​contentType | Base | required | MimeType | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | Communication | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | Communication | 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-4 | error | Communication | 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-5 | error | Communication | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | Communication | A resource should have narrative for robust management | `text.`div`.exists()`
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

This structure is derived from Communication

Summary

Mandatory: 8 elements(3 nested mandatory elements)
Must-Support: 14 elements
Prohibited: 16 elements

Slices

This structure defines the following Slices:

- The element 1 is sliced based on the value of Communication.payload.content[x]

Key Elements View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | S Σ | 0..1 | Identifier | Unique identifier
use | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
value | S Σ | 0..1 | string | The value that is unique Example General: 123456
status | ?!S Σ | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown Binding: EventStatus (required): The status of the communication.
category | S | 1..1 | CodeableConcept | Message category Binding: CommunicationCategory (example): Codes for general categories of communications such as alerts, instructions, etc.
coding | S Σ | 1..1 | Coding | Code defined by a terminology system
system | S Σ | 1..1 | uri | Identity of the terminology system
code | S Σ | 1..1 | code | Symbol in syntax defined by the system
subject | S Σ | 1..1 | Reference(Patient | Group) | Focus of message
display | Σ | 0..1 | string | External name of patient
sent | S | 1..1 | dateTime | When sent
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
payload | S | 1..1 | BackboneElement | Message payload
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
Slices for content[x] |  | 1..1 |  | Message part content Slice: Unordered, Open by type:$this
contentString |  |  | string |
contentAttachment |  |  | Attachment |
contentReference |  |  | Reference(Resource) |
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
contentType | S Σ | 1..1 | code | Mime type of the content, with charset etc. Binding: Mime Types (required): The mime type of an attachment. Any valid mime type is allowed. Example General: text/plain; charset=UTF-8, image/png
data | S | 1..1 | base64Binary | Data inline, base64ed
title | S Σ | 1..1 | string | Label to display in place of the data Example General: Official Corporate Logo
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Communication.identifier.​use | Base | required | IdentifierUse | 📍4.0.1 | FHIR Std.
Communication.status | Base | required | EventStatus | 📍4.0.1 | FHIR Std.
Communication.category | Base | example | CommunicationCategory | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​contentType | Base | required | MimeType | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | Communication | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | Communication | 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-4 | error | Communication | 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-5 | error | Communication | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | Communication | A resource should have narrative for robust management | `text.`div`.exists()`
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

Differential View

This structure is derived from Communication

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
extension |  | 0..0 |  | Extension
identifier | S | 0..1 | Identifier | Unique identifier
value | S | 0..1 | string | The value that is unique
instantiatesCanonical |  | 0..0 |  | Instantiates FHIR protocol or definition
basedOn |  | 0..0 |  | Request fulfilled by this communication
partOf |  | 0..0 |  | Part of this action
inResponseTo |  | 0..0 |  | Reply to
status | S | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown
statusReason |  | 0..0 |  | Reason for current status
category | S | 1..1 | CodeableConcept | Message category
coding | S | 1..1 | Coding | Code defined by a terminology system
system | S | 1..1 | uri | Identity of the terminology system
code | S | 1..1 | code | Symbol in syntax defined by the system
priority |  | 0..0 |  | routine | urgent | asap | stat
medium |  | 0..0 |  | A channel of communication
subject | S | 1..1 | Reference(Patient | Group) | Focus of message
display |  | 0..1 | string | External name of patient
topic |  | 0..0 |  | Description of the purpose/content
about |  | 0..0 |  | Resources that pertain to this communication
encounter |  | 0..0 |  | Encounter created as part of
sent | S | 1..1 | dateTime | When sent
received |  | 0..0 |  | When received
recipient |  | 0..0 |  | Message recipient
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
reasonCode |  | 0..0 |  | Indication for message
reasonReference |  | 0..0 |  | Why was communication done?
payload | S | 1..1 | BackboneElement | Message payload
Slices for content[x] |  | 1..1 | string, Attachment, Reference(Resource) | Message part content Slice: Unordered, Open by type:$this
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
contentType | S | 1..1 | code | Mime type of the content, with charset etc.
data | S | 1..1 | base64Binary | Data inline, base64ed
title | S | 1..1 | string | Label to display in place of the data
note |  | 0..0 |  | Comments made about the communication
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Communication |  | 0..* | Communication | A record of information transmitted from a sender to a receiver
id | Σ | 0..1 | id | Logical id of this artifact
meta | Σ | 0..1 | Meta | Metadata about the resource
implicitRules | ?!Σ | 0..1 | uri | A set of rules under which this content was created
language |  | 0..1 | code | Language of the resource content Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
text |  | 0..1 | Narrative | Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained |  | 0..* | Resource | Contained, inline Resources
modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored
identifier | S Σ | 0..1 | Identifier | Unique identifier
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
use | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type | Σ | 0..1 | CodeableConcept | Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system | Σ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value | S Σ | 0..1 | string | The value that is unique Example General: 123456
period | Σ | 0..1 | Period | Time period when id is/was valid for use
assigner | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text)
instantiatesUri | Σ | 0..* | uri | Instantiates external protocol or definition
status | ?!S Σ | 1..1 | code | preparation | in-progress | not-done | on-hold | stopped | completed | entered-in-error | unknown Binding: EventStatus (required): The status of the communication.
category | S | 1..1 | CodeableConcept | Message category Binding: CommunicationCategory (example): Codes for general categories of communications such as alerts, instructions, etc.
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
coding | S Σ | 1..1 | Coding | Code defined by a terminology system
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
system | S Σ | 1..1 | uri | Identity of the terminology system
version | Σ | 0..1 | string | Version of the system - if relevant
code | S Σ | 1..1 | code | Symbol in syntax defined by the system
display | Σ | 0..1 | string | Representation defined by the system
userSelected | Σ | 0..1 | boolean | If this coding was chosen directly by the user
text | Σ | 0..1 | string | Plain text representation of the concept
subject | S Σ | 1..1 | Reference(Patient | Group) | Focus of message
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
reference | Σ C | 0..1 | string | Literal reference, Relative, internal or absolute URL
type | Σ | 0..1 | uri | Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model).
identifier | Σ | 0..1 | Identifier | Logical reference, when literal reference is not known
display | Σ | 0..1 | string | External name of patient
sent | S | 1..1 | dateTime | When sent
sender | S | 1..1 | Reference(Device | Organization | Patient | Practitioner | PractitionerRole | RelatedPerson | HealthcareService) | Message sender
payload | S | 1..1 | BackboneElement | Message payload
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations
modifierExtension | ?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized
Slices for content[x] |  | 1..1 |  | Message part content Slice: Unordered, Open by type:$this
contentString |  |  | string |
contentAttachment |  |  | Attachment |
contentReference |  |  | Reference(Resource) |
content[x]:contentAttachment |  | 0..1 | Attachment | Message part content
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
contentType | S Σ | 1..1 | code | Mime type of the content, with charset etc. Binding: Mime Types (required): The mime type of an attachment. Any valid mime type is allowed. Example General: text/plain; charset=UTF-8, image/png
language | Σ | 0..1 | code | Human language of the content (BCP-47) Binding: CommonLanguages (preferred): A human language.
Additional Bindings | Purpose
AllLanguages | Max Binding
Example General: en-AU
data | S | 1..1 | base64Binary | Data inline, base64ed
url | Σ | 0..1 | url | Uri where the data can be found Example General: http://www.acme.com/logo-small.png
size | Σ | 0..1 | unsignedInt | Number of bytes of content (if url provided)
hash | Σ | 0..1 | base64Binary | Hash of the data (sha-1, base64ed)
title | S Σ | 1..1 | string | Label to display in place of the data Example General: Official Corporate Logo
creation | Σ | 0..1 | dateTime | Date attachment was first created
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Communication.language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.
Communication.identifier.​use | Base | required | IdentifierUse | 📍4.0.1 | FHIR Std.
Communication.identifier.​type | Base | extensible | IdentifierType | 📍4.0.1 | FHIR Std.
Communication.status | Base | required | EventStatus | 📍4.0.1 | FHIR Std.
Communication.category | Base | example | CommunicationCategory | 📍4.0.1 | FHIR Std.
Communication.subject.​type | Base | extensible | ResourceType | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​contentType | Base | required | MimeType | 📍4.0.1 | FHIR Std.
Communication.payload.​content[x]:contentAttachment.​language | Base | preferred | Common Languages | 📍4.0.1 | FHIR Std.

#### Constraints

Id | Grade | Path(s) | Description | Expression
dom-2 | error | Communication | If the resource is contained in another resource, it SHALL NOT contain nested Resources | `contained.contained.empty()`
dom-3 | error | Communication | 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-4 | error | Communication | 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-5 | error | Communication | If a resource is contained in another resource, it SHALL NOT have a security label | `contained.meta.security.empty()`
dom-6 | best practice | Communication | A resource should have narrative for robust management | `text.`div`.exists()`
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

This structure is derived from Communication

Summary

Mandatory: 8 elements(3 nested mandatory elements)
Must-Support: 14 elements
Prohibited: 16 elements

Slices

This structure defines the following Slices:

- The element 1 is sliced based on the value of Communication.payload.content[x]

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