http://hl7.org/fhir/StructureDefinition/cqf-isPrimaryCitation|5.2.0

Specifies whether the related artifact is defining a primary citation for the artifact (i.e. one that should appear in the narrative for the artifact specification.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.url.typehttp://hl7.org/fhir/StructureDefinition/uri
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/boolean