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.
element_idtypes
Extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]