http://hl7.org/fhir/StructureDefinition/humanname-partner-prefix|4.0.1

The prefix portion (e.g. voorvoegsel) of the family name that is derived from the person's partner's surname, as distinguished from any portion that is derived from the surname of the person's own.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/string