reference-rest-or-logical
type: StructureDefinition
node role: treeRoot
id:
  v: reference-rest-or-logical
text:
  status:
    v: extensions
  div: Generated Narrative: StructureDefinition reference-rest-or-logical Name Flags Card. Type Description & Constraints Reference C 0..* Reference A reference from one resource to another PA-ident-1: reference or identifier must be present PA-ident-2: If reference is not present, display must be present reference SC 0..1 string Literal reference, Relative, internal or absolute URL identifier SC 0..1 Identifier Logical reference, when literal reference is not known system 0..1 uri The namespace for the identifier value Required Pattern: http://hl7.org/fhir/sid/us-npi value S 1..1 string The value that is unique display SC 0..1 string Text alternative for the resource Documentation for this format
url:
  v: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
version:
  v: 0.0.1-current
name:
  v: ReferenceRestOrLogical
title:
  v: Reference - RESTful or Logical
status:
  v: draft
date:
  v: 2025-06-10T07:39:07+00:00
publisher:
  v: NHS England
contact:
  telecom:
    system:
      v: url
    value:
      v: https://www.ihe.net/ihe_domains/it_infrastructure/
contact:
  telecom:
    system:
      v: email
contact:
  name:
    v: NHS England
  telecom:
    system:
      v: email
description:
  v: A Reference data type where the referenced resource could be resolvable RESTfully or pointed to logically.
jurisdiction:
  coding:
    system:
      v: urn:iso:std:iso:3166
    code:
      v: GB
    display:
      v: United Kingdom of Great Britain and Northern Ireland
fhir version:
  v: 4.0.1
mapping:
  identity:
    v: rim
  uri:
    v: http://hl7.org/v3
  name:
    v: RIM Mapping
kind:
  v: complex-type
abstract:
  v: false
type:
  v: Reference
base definition:
  v: http://hl7.org/fhir/StructureDefinition/Reference
  link: http://hl7.org/fhir/StructureDefinition/Reference
derivation:
  v: constraint
snapshot:
  extension:
    url:
      v: http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version
    value: string
      v: 4.0.1
  element:
    id:
      v: Reference
    path:
      v: Reference
    short:
      v: A reference from one resource to another
    definition:
      v: A reference from one resource to another.
    comment:
      v: 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.
    min:
      v: 0
    max:
      v: *
    base:
      path:
        v: Reference
      min:
        v: 0
      max:
        v: *
    condition:
      v: ele-1
    constraint:
      key:
        v: ele-1
      severity:
        v: error
      human:
        v: All FHIR elements must have a @value or children
      expression:
        v: hasValue() or (children().count() > id.count())
      xpath:
        v: @value|f:*|h:div
      source:
        v: http://hl7.org/fhir/StructureDefinition/Element
        link: http://hl7.org/fhir/StructureDefinition/Element
    constraint:
      key:
        v: ref-1
      severity:
        v: error
      human:
        v: SHALL have a contained resource if a local reference is provided
      expression:
        v: reference.startsWith('#').not() or (reference.substring(1).trace('url') in %rootResource.contained.id.trace('ids'))
      xpath:
        v: not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])
      source:
        v: http://hl7.org/fhir/StructureDefinition/Reference
        link: http://hl7.org/fhir/StructureDefinition/Reference
    constraint:
      key:
        v: PA-ident-1
      severity:
        v: error
      human:
        v: reference or identifier must be present
      expression:
        v: reference.exists() or identifier.exists()
      xpath:
        v: exists(f:reference) or exists(f:identifier)
      source:
        v: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
        link: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
    constraint:
      key:
        v: PA-ident-2
      severity:
        v: error
      human:
        v: If reference is not present, display must be present
      expression:
        v: reference.exists().not() implies display.exists()
      xpath:
        v: exists(f:reference) or exists(f:display)
      source:
        v: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
        link: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
    is modifier:
      v: false
    mapping:
      identity:
        v: rim
      map:
        v: n/a
    mapping:
      identity:
        v: rim
      map:
        v: The target of a resource reference is a RIM entry point (Act, Role, or Entity)
  element:
    id:
      v: Reference.id
    path:
      v: Reference.id
    representation:
      v: xmlAttr
    short:
      v: Unique id for inter-element referencing
    definition:
      v: Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
    min:
      v: 0
    max:
      v: 1
    base:
      path:
        v: Element.id
      min:
        v: 0
      max:
        v: 1
    type:
      extension:
        value: url
      code:
        v: http://hl7.org/fhirpath/System.String
    is modifier:
      v: false
    is summary:
      v: false
    mapping:
      identity:
        v: rim
      map:
        v: n/a

url
v: string

id:
  v: Reference.extension
path:
  v: Reference.extension
slicing:
  discriminator:
    type:
      v: value
    path:
      v: url
  description:
    v: Extensions are always sliced by (at least) url
  rules:
    v: open
short:
  v: Additional content defined by implementations
definition:
  v: 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.
comment:
  v: 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.
alias:
  v: extensions
alias:
  v: user content
min:
  v: 0
max:
  v: *
base:
  path:
    v: Element.extension
  min:
    v: 0
  max:
    v: *
type:
  code:
    v: Extension
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
constraint:
  key:
    v: ext-1
  severity:
    v: error
  human:
    v: Must have either extensions or value[x], not both
  expression:
    v: extension.exists() != value.exists()
  xpath:
    v: exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])
  source:
    v: http://hl7.org/fhir/StructureDefinition/Extension
    link: http://hl7.org/fhir/StructureDefinition/Extension
is modifier:
  v: false
is summary:
  v: false
mapping:
  identity:
    v: rim
  map:
    v: n/a

id:
  v: Reference.reference
path:
  v: Reference.reference
short:
  v: Literal reference, Relative, internal or absolute URL
definition:
  v: A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources.
comment:
  v: Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries. Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Reference.reference
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: string
condition:
  v: ref-1
condition:
  v: PA-ident-1
condition:
  v: PA-ident-2
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
must support:
  v: true
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: rim
  map:
    v: N/A

id:
  v: Reference.type
path:
  v: Reference.type
short:
  v: Type the reference refers to (e.g. "Patient")
definition:
  v: The expected type of the target of the reference. If both Reference.type and Reference.reference are populated and Reference.reference is a FHIR URL, both SHALL be consistent. The type is the Canonical URL of Resource Definition that is the type this reference refers to. References are URLs that are relative to http://hl7.org/fhir/StructureDefinition/ e.g. "Patient" is a reference to http://hl7.org/fhir/StructureDefinition/Patient. Absolute URLs are only allowed for logical models (and can only be used in references in logical models, not resources).
comment:
  v: This element is used to indicate the type of the target of the reference. This may be used which ever of the other elements are populated (or not). In some cases, the type of the target may be determined by inspection of the reference (e.g. a RESTful URL) or by resolving the target of the reference; if both the type and a reference is provided, the reference SHALL resolve to a resource of the same type as that specified.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Reference.type
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: uri
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: false
is summary:
  v: true
binding:
  extension:
    url:
      v: http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName
    value: string
      v: FHIRResourceTypeExt
  strength:
    v: extensible
  description:
    v: Aa resource (or, for logical models, the URI of the logical model).
  value set:
    v: http://hl7.org/fhir/ValueSet/resource-types
    link: http://hl7.org/fhir/ValueSet/resource-types
mapping:
  identity:
    v: rim
  map:
    v: N/A

id:
  v: Reference.identifier
path:
  v: Reference.identifier
short:
  v: Logical reference, when literal reference is not known
definition:
  v: An identifier for the target resource. This is used when there is no way to reference the other resource directly, either because the entity it represents is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference.
comment:
  v: When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy. When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it. Reference is intended to point to a structure that can potentially be expressed as a FHIR resource, though there is no need for it to exist as an actual FHIR resource instance - except in as much as an application wishes to actual find the target of the reference. The content referred to be the identifier must meet the logical constraints implied by any limitations on what resource types are permitted for the reference. For example, it would not be legitimate to send the identifier for a drug prescription if the type were Reference(Observation|DiagnosticReport). One of the use-cases for Reference.identifier is the situation where no FHIR representation exists (where the type is Reference (Any).
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Reference.identifier
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: Identifier
condition:
  v: PA-ident-1
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
must support:
  v: true
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: rim
  map:
    v: .identifier

id:
  v: Reference.identifier.id
path:
  v: Reference.identifier.id
representation:
  v: xmlAttr
short:
  v: Unique id for inter-element referencing
definition:
  v: Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Element.id
  min:
    v: 0
  max:
    v: 1
type:
  extension:
    url:
      v: http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type
    value: url
      v: string
  code:
    v: http://hl7.org/fhirpath/System.String
is modifier:
  v: false
is summary:
  v: false
mapping:
  identity:
    v: rim
  map:
    v: n/a

id:
  v: Reference.identifier.extension
path:
  v: Reference.identifier.extension
slicing:
  discriminator:
    type:
      v: value
    path:
      v: url
  description:
    v: Extensions are always sliced by (at least) url
  rules:
    v: open
short:
  v: Additional content defined by implementations
definition:
  v: 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.
comment:
  v: 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.
alias:
  v: extensions
alias:
  v: user content
min:
  v: 0
max:
  v: *
base:
  path:
    v: Element.extension
  min:
    v: 0
  max:
    v: *
type:
  code:
    v: Extension
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
constraint:
  key:
    v: ext-1
  severity:
    v: error
  human:
    v: Must have either extensions or value[x], not both
  expression:
    v: extension.exists() != value.exists()
  xpath:
    v: exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])
  source:
    v: http://hl7.org/fhir/StructureDefinition/Extension
    link: http://hl7.org/fhir/StructureDefinition/Extension
is modifier:
  v: false
is summary:
  v: false
mapping:
  identity:
    v: rim
  map:
    v: n/a

id:
  v: Reference.identifier.use
path:
  v: Reference.identifier.use
short:
  v: usual | official | temp | secondary | old (If known)
definition:
  v: The purpose of this identifier.
comment:
  v: Applications can assume that an identifier is permanent unless it explicitly says that it is temporary.
requirements:
  v: Allows the appropriate identifier for a particular context of use to be selected from among a set of identifiers.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Identifier.use
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: code
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: true
is modifier reason:
  v: This is labeled as "Is Modifier" because applications should not mistake a temporary id for a permanent one.
is summary:
  v: true
binding:
  extension:
    url:
      v: http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName
    value: string
      v: IdentifierUse
  strength:
    v: required
  description:
    v: Identifies the purpose for this identifier, if known .
  value set:
    v: http://hl7.org/fhir/ValueSet/identifier-use|4.0.1
    link: 4.0
    link: .1
mapping:
  identity:
    v: v2
  map:
    v: N/A
mapping:
  identity:
    v: rim
  map:
    v: Role.code or implied by context

id:
  v: Reference.identifier.type
path:
  v: Reference.identifier.type
short:
  v: Description of identifier
definition:
  v: A coded type for the identifier that can be used to determine which identifier to use for a specific purpose.
comment:
  v: This element deals only with general categories of identifiers. It SHOULD not be used for codes that correspond 1..1 with the Identifier.system. Some identifiers may fall into multiple categories due to common usage. Where the system is known, a type is unnecessary because the type is always part of the system definition. However systems often need to handle identifiers where the system is not known. There is not a 1:1 relationship between type and system, since many different systems have the same type.
requirements:
  v: Allows users to make use of identifiers when the identifier system is not known.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Identifier.type
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: CodeableConcept
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: false
is summary:
  v: true
binding:
  extension:
    url:
      v: http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName
    value: string
      v: IdentifierType
  strength:
    v: extensible
  description:
    v: A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
  value set:
    v: http://hl7.org/fhir/ValueSet/identifier-type
    link: http://hl7.org/fhir/ValueSet/identifier-type
mapping:
  identity:
    v: v2
  map:
    v: CX.5
mapping:
  identity:
    v: rim
  map:
    v: Role.code or implied by context

id:
  v: Reference.identifier.system
path:
  v: Reference.identifier.system
short:
  v: The namespace for the identifier value
definition:
  v: Establishes the namespace for the value - that is, a URL that describes a set values that are unique.
comment:
  v: Identifier.system is always case sensitive.
requirements:
  v: There are many sets of identifiers. To perform matching of two identifiers, we need to know what set we're dealing with. The system identifies a particular set of unique identifiers.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Identifier.system
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: uri
pattern: uri
  v: http://hl7.org/fhir/sid/us-npi
example:
  label:
    v: General
  value: uri
    v: http://www.acme.com/identifiers/patient
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: v2
  map:
    v: CX.4 / EI-2-4
mapping:
  identity:
    v: rim
  map:
    v: II.root or Role.id.root
mapping:
  identity:
    v: servd
  map:
    v: ./IdentifierType

id:
  v: Reference.identifier.value
path:
  v: Reference.identifier.value
short:
  v: The value that is unique
definition:
  v: The portion of the identifier typically relevant to the user and which is unique within the context of the system.
comment:
  v: If the value is a full URI, then the system SHALL be urn:ietf:rfc:3986. The value's primary purpose is computational mapping. As a result, it may be normalized for comparison purposes (e.g. removing non-significant whitespace, dashes, etc.) A value formatted for human display can be conveyed using the [Rendered Value extension](http://hl7.org/fhir/R4/extension-rendered-value.html). Identifier.value is to be treated as case sensitive unless knowledge of the Identifier.system allows the processer to be confident that non-case-sensitive processing is safe.
min:
  v: 1
max:
  v: 1
base:
  path:
    v: Identifier.value
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: string
example:
  label:
    v: General
  value: string
    v: 123456
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
must support:
  v: true
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: v2
  map:
    v: CX.1 / EI.1
mapping:
  identity:
    v: rim
  map:
    v: II.extension or II.root if system indicates OID or GUID (Or Role.id.extension or root)
mapping:
  identity:
    v: servd
  map:
    v: ./Value

id:
  v: Reference.identifier.period
path:
  v: Reference.identifier.period
short:
  v: Time period when id is/was valid for use
definition:
  v: Time period during which identifier is/was valid for use.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Identifier.period
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: Period
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: v2
  map:
    v: CX.7 + CX.8
mapping:
  identity:
    v: rim
  map:
    v: Role.effectiveTime or implied by context
mapping:
  identity:
    v: servd
  map:
    v: ./StartDate and ./EndDate

id:
  v: Reference.identifier.assigner
path:
  v: Reference.identifier.assigner
short:
  v: Organization that issued id (may be just text)
definition:
  v: Organization that issued/manages the identifier.
comment:
  v: The Identifier.assigner may omit the .reference element and only contain a .display element reflecting the name or other textual information about the assigning organization.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Identifier.assigner
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: Reference
  target profile:
    v: http://hl7.org/fhir/StructureDefinition/Organization
    link: http://hl7.org/fhir/StructureDefinition/Organization
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: v2
  map:
    v: CX.4 / (CX.4,CX.9,CX.10)
mapping:
  identity:
    v: rim
  map:
    v: II.assigningAuthorityName but note that this is an improper use by the definition of the field. Also Role.scoper
mapping:
  identity:
    v: servd
  map:
    v: ./IdentifierIssuingAuthority

id:
  v: Reference.display
extension:
  url:
    v: http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable
  value: boolean
    v: true
path:
  v: Reference.display
short:
  v: Text alternative for the resource
definition:
  v: Plain text narrative that identifies the resource in addition to the resource reference.
comment:
  v: This is generally not the same as the Resource.text of the referenced resource. The purpose is to identify what's being referenced, not to fully describe it.
min:
  v: 0
max:
  v: 1
base:
  path:
    v: Reference.display
  min:
    v: 0
  max:
    v: 1
type:
  code:
    v: string
condition:
  v: PA-ident-2
constraint:
  key:
    v: ele-1
  severity:
    v: error
  human:
    v: All FHIR elements must have a @value or children
  expression:
    v: hasValue() or (children().count() > id.count())
  xpath:
    v: @value|f:*|h:div
  source:
    v: http://hl7.org/fhir/StructureDefinition/Element
    link: http://hl7.org/fhir/StructureDefinition/Element
must support:
  v: true
is modifier:
  v: false
is summary:
  v: true
mapping:
  identity:
    v: rim
  map:
    v: N/A

element:
  id:
    v: Reference
  path:
    v: Reference
  constraint:
    key:
      v: PA-ident-1
    severity:
      v: error
    human:
      v: reference or identifier must be present
    expression:
      v: reference.exists() or identifier.exists()
    xpath:
      v: exists(f:reference) or exists(f:identifier)
    source:
      v: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
      link: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
  constraint:
    key:
      v: PA-ident-2
    severity:
      v: error
    human:
      v: If reference is not present, display must be present
    expression:
      v: reference.exists().not() implies display.exists()
    xpath:
      v: exists(f:reference) or exists(f:display)
    source:
      v: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
      link: https://fhir.nhs.uk/England/RAD/StructureDefinition/reference-rest-or-logical
element:
  id:
    v: Reference.reference
  path:
    v: Reference.reference
  condition:
    v: PA-ident-1
  condition:
    v: PA-ident-2
  must support:
    v: true
element:
  id:
    v: Reference.identifier
  path:
    v: Reference.identifier
  condition:
    v: PA-ident-1
  must support:
    v: true
element:
  id:
    v: Reference.identifier.system
  path:
    v: Reference.identifier.system
  pattern: uri
    v: http://hl7.org/fhir/sid/us-npi
element:
  id:
    v: Reference.identifier.value
  path:
    v: Reference.identifier.value
  min:
    v: 1
  must support:
    v: true
element:
  id:
    v: Reference.display
  path:
    v: Reference.display
  condition:
    v: PA-ident-2
  must support:
    v: true