This page is part of the FHIR Specification (v4.0.1: R4 - Mixed Normative and STU) in it's permanent home (it will always be available at this URL). 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: R5 R4B R4 R3 R2
FHIR Infrastructure Work Group | Maturity Level: Normative | Standards Status: Normative |
This page has been approved as part of an ANSI standard. See the Infrastructure Package for further details. |
Extension | |||||||||
Standards Status | This element has a standards status of "Normative" | ||||||||
Definition | Optional Extension Element - found in all resources. | ||||||||
Cardinality | 0..* | ||||||||
Type | Element | ||||||||
Requirements | The ability to add extensions in a structured way is what keeps FHIR resources simple. | ||||||||
Invariants |
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Extension.url | |||||||||
Definition | Source of the definition for the extension code - a logical name or a URL. | ||||||||
Cardinality | 1..1 | ||||||||
Type | uri | ||||||||
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. | ||||||||
Extension.value[x] | |||||||||
Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list). | ||||||||
Cardinality | 0..1 | ||||||||
Type | * | ||||||||
[x] Note | See Choice of Data Types for further information about how to use [x] |