http://hl7.org/fhir/StructureDefinition/patient-preferenceType|5.2.0

Indicates what mode of communication the patient prefers to use for the indicated language.

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