http://hl7.org/fhir/StructureDefinition/hla-genotyping-results-allele-database|5.2.0

Allele Database.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/CodeableConcept