http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-direction|5.2.0

Direction (e.g., N, S, W, E).
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/string