http://hl7.org/fhir/StructureDefinition/structuredefinition-explicit-type-name|4.0.1

A name to use for the type, in implementations. This is a suggestion; it's not a normative part of the FHIR specification, but it does appear in the UML diagrams, and is used in generated code, schemas, etc.to identify the type.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Advisory - name of Type for implementations
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueString *
1..?string