R4 Ballot #2 (Mixed Normative/Trial use)

This page is part of the FHIR Specification (v3.5.0: R4 Ballot #2). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R4B R4

Extension constraint - Detailed Descriptions

FHIR Infrastructure Work Group Maturity Level: 1InformativeUse Context: Any

Detailed Descriptions for the elements in the extension.

Extension
Element IdExtension
Definition

An invariant that must be satisfied before responses to the questionnaire can be considered "complete".

Control0..* This element is affected by the following invariants: ele-1
Comments

This maps to the ElementDefinition.constraint element.

Invariants
Inherited by this element
ele-1RuleAll FHIR elements must have a @value or childrenhasValue() or (children().count() > id.count())
ext-1RuleMust have either extensions or value[x], not bothextension.exists() != value.exists()
Extension.id
Element IdExtension.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension
Element IdExtension.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.

Control0..*
TypeExtension
Alternate Namesextensions, 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.

SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension(key)
Element IdExtension.extension:key
Definition

Unique id for the constraint within the questionnaire.

Control1..1
TypeExtension
Extension.extension.id
Element IdExtension.extension:key.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:key.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:key.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valuekey
Extension.extension.valueId
Element IdExtension.extension:key.valueId
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Typeid
Extension.extension(requirements)
Element IdExtension.extension:requirements
Definition

An explanation of why this extension is required (for documentation purposes).

Control0..1
TypeExtension
Extension.extension.id
Element IdExtension.extension:requirements.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:requirements.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:requirements.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valuerequirements
Extension.extension.valueString
Element IdExtension.extension:requirements.valueString
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Typestring
Extension.extension(severity)
Element IdExtension.extension:severity
Definition

Indicates how serious violating the invariant is.

Control1..1
TypeExtension
Extension.extension.id
Element IdExtension.extension:severity.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:severity.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:severity.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valueseverity
Extension.extension.valueCode
Element IdExtension.extension:severity.valueCode
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Terminology BindingHow important the invariant is.
The codes SHALL be taken from ConstraintSeverity
Typecode
Extension.extension(expression)
Element IdExtension.extension:expression
Definition

The FHIRPath expression of the rule for computable interpretation.

Control1..1
TypeExtension
Extension.extension.id
Element IdExtension.extension:expression.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:expression.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:expression.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valueexpression
Extension.extension.valueString
Element IdExtension.extension:expression.valueString
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Typestring
Extension.extension(human)
Element IdExtension.extension:human
Definition

A free text expression of the rule to display to the user if the rule is violated.

Control1..1
TypeExtension
Extension.extension.id
Element IdExtension.extension:human.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:human.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:human.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valuehuman
Extension.extension.valueString
Element IdExtension.extension:human.valueString
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Typestring
Extension.extension(location)
Element IdExtension.extension:location
Definition

Relative paths to the questions this rule is enforced against.

Control0..*
TypeExtension
Extension.extension.id
Element IdExtension.extension:location.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Control0..1
Typestring
Extension.extension.extension
Element IdExtension.extension:location.extension
Definition

An Extension

Control0..0
TypeExtension
SlicingThis element introduces a set of slices. The slicing rules are:
  • unordered
  • Open
  • discriminators: value:url
Extension.extension.url
Element IdExtension.extension:location.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valuelocation
Extension.extension.valueString
Element IdExtension.extension:location.valueString
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..1
Typestring
Extension.url
Element IdExtension.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
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.

Fixed Valuehttp://hl7.org/fhir/StructureDefinition/questionnaire-constraint
Extension.value[x]
Element IdExtension.value[x]
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control0..0
TypeChoice of: 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, ParameterDefinition, DataRequirement, RelatedArtifact, ContactDetail, Contributor, TriggerDefinition, Expression, UsageContext, Dosage
[x] NoteSee Choice of Data Types for further information about how to use [x]