http://hl7.org/fhir/StructureDefinition/alternate-reference|5.2.0

Used when the target of the reference has a type that is not allowed by the definition of the element. In general, this should only arise when wrangling between versions using cross-version extensions.

Structure JSON Dependencies FHIRSchema Other Versions Dependant (0)Elements Summary

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