http://hl7.org/fhir/StructureDefinition/task-replaces|5.2.0

Completed or terminated task(s) whose function is taken by this new task.

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