http://hl7.org/fhir/StructureDefinition/structuredefinition-interface|5.2.0

Marks that the resource definition represents an [interface](uml.html#interface) rather than a resource.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/boolean