http://hl7.org/fhir/StructureDefinition/humanname-partner-name|5.2.0

The portion 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 name.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Portion derived from person's partner's surname
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueString *
1..?string