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

External Identifiers associated with this element - these are identifiers that are associated with the concept this element represents.

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