http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element|4.0.1

The specific element to use in the referenced profile. This is used when a backbone element is being profiled, rather than an established type.
Base: http://hl7.org/fhir/StructureDefinition/Extension4.0.1, 5.0.0, 4.0.1
Type: Extension (a.k.a: http://hl7.org/fhir/StructureDefinition/Extension)
Type dependencies: 2
Elements