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Salient Field Extension

Canonical../StructureDefinition/salient-field
Statusdraft · 1.26.0
BaseExtension (constraint)
ContextStructureDefinition (element)
SourceFSH · JSON

One salient synthesized accessor on a profile: a named, typed FHIRPath value expression over the resource. Drives the reader/render surface (the AI chart) and the facade's salient accessors, distinct from the validation-scoped element set.

Elements / Details

Every element this profile touches, with its full definition. Element names in the tables link here.

Extension

Short Salient Field
Definition One salient synthesized accessor on a profile: a named, typed FHIRPath value expression over the resource. Drives the reader/render surface (the AI chart) and the facade's salient accessors, distinct from the validation-scoped element set.
Cardinality 0..*
Invariants ele-1, ext-1

Extension.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension

Short Additional content defined by implementations
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.
Cardinality 2..*
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:key

Short The accessor name (snake_cased in the facade)
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.
Cardinality 1..1
Type Extension
Must Support yes
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:key.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:key.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:key.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value key

Extension.extension:key.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type code
Invariants ele-1

Extension.extension:expression

Short A restricted FHIRPath VALUE expression over the resource (raw FHIR)
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.
Cardinality 1..1
Type Extension
Must Support yes
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:expression.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:expression.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:expression.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value expression

Extension.extension:expression.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type string
Invariants ele-1

Extension.extension:type

Short The scalar return type (FieldKind: string | code | dateTime | integer | boolean)
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.
Cardinality 0..1
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:type.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:type.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:type.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value type

Extension.extension:type.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type code
Invariants ele-1

Extension.extension:chartName

Short The rendered attribute name (defaults to key)
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.
Cardinality 0..1
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:chartName.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:chartName.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:chartName.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value chartName

Extension.extension:chartName.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type string
Invariants ele-1

Extension.extension:short

Short One-line summary, as ElementDefinition.short. Inherited from the referenced element when absent
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.
Cardinality 0..1
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:short.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:short.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:short.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value short

Extension.extension:short.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type string
Invariants ele-1

Extension.extension:definition

Short Full definition, as ElementDefinition.definition. Carried into the generated docstring and the pydantic schema, so this is the text an LLM reads
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.
Cardinality 0..1
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:definition.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:definition.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:definition.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value definition

Extension.extension:definition.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type markdown
Invariants ele-1

Extension.extension:comment

Short Usage notes, as ElementDefinition.comment. Where to say what a derived expression does that its leaf element does not
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.
Cardinality 0..1
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:comment.id

Short 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.
Cardinality 0..1
Type http://hl7.org/fhirpath/System.String

Extension.extension:comment.extension

Short Additional content defined by implementations
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.
Cardinality 0..0
Type Extension
Invariants ele-1, ext-1
Also called extensions, user content

Extension.extension:comment.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value comment

Extension.extension:comment.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..1
Type markdown
Invariants ele-1

Extension.url

Short identifies the meaning of the extension
Definition Source of the definition for the extension code - a logical name or a URL.
Comments The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Cardinality 1..1
Type http://hl7.org/fhirpath/System.String
Fixed value ../StructureDefinition/salient-field

Extension.value[x]

Short Value of extension
Definition Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Cardinality 0..0
Type base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta
Invariants ele-1