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FHIR Infrastructure Work GroupMaturity Level: 5Ballot Status: Normative

Normative Candidate Note: This page is candidate normative content for R4 in the Infrastructure Package. Once normative, it will lose it's Maturity Level, and breaking changes will no longer be made.

Standards StatusThis element has a standards status of "Normative" which is different from the status of the whole resource

Base definition for all elements in a resource.

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

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


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.

Alternate Namesextensions; user content

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.