Release 5 Preview #3
FHIR Infrastructure Work GroupMaturity Level: NormativeStandards Status: Normative
This page has been approved as part of an ANSI standard. See the Infrastructure Package for further details.

This page provides the detailed descriptions for the type framework:

See also Base Definition, Profiles & Extensions, Mappings and R3 Conversions.

Base
Standards StatusThis element has a standards status of "Normative"
Definition

Base definition for all types defined in FHIR type system.

Cardinality0..*

See also Element Definition, Profiles & Extensions, Mappings and R3 Conversions.

Element
Standards StatusThis element has a standards status of "Normative"
Definition

Base definition for all elements in a resource.

Cardinality0..*
TypeBase
Invariants
Defined on this element
ele-1Rule All FHIR elements must have a @value or childrenhasValue() or (children().count() > id.count())
Affect this element
Element.id
Definition

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

Cardinality0..1
Typestring
Element.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.

Cardinality0..*
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.

See also BackboneElement Definition, Profiles & Extensions, Mappings and R3 Conversions.

BackboneElement
Standards StatusThis element has a standards status of "Normative"
Definition

Base definition for all elements that are defined inside a resource - but not those in a data type.

Cardinality0..*
TypeElement
BackboneElement.modifierExtension
Definition

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

Cardinality0..*
TypeExtension
Is Modifiertrue (Reason: Modifier extensions are expected to modify the meaning or interpretation of the element that contains them)
Requirements

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Alternate Namesextensions; user content; modifiers
Summarytrue
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.

See also DataType Definition, Profiles & Extensions, Mappings and R3 Conversions.

DataType
Standards StatusThis element has a standards status of "Normative"
Definition

The base class for all re-useable types defined as part of the FHIR Specification.

Cardinality0..*
TypeElement

See also BackboneType Definition, Profiles & Extensions, Mappings and R3 Conversions.

BackboneType
Standards StatusThis element has a standards status of "Normative"
Definition

Base definition for the few data types that are allowed to carry modifier extensions.

Cardinality0..*
TypeDataType
BackboneType.modifierExtension
Definition

May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

Cardinality0..*
TypeExtension
Is Modifiertrue (Reason: Modifier extensions are expected to modify the meaning or interpretation of the element that contains them)
Requirements

Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

Alternate Namesextensions; user content; modifiers
Summarytrue
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.

See also PrimitiveType Definition, Profiles & Extensions, Mappings and R3 Conversions.

PrimitiveType
Standards StatusThis element has a standards status of "Normative"
Definition

The base type for all re-useable types defined that have a simple property.

Cardinality0..*
TypeDataType