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

The level of equivalence between the element containing the mapping and the element mapped to.

element_id	types
Extension
Extension.extension
Extension.url
Extension.value[x]	code
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	code