http://hl7.org/fhir/StructureDefinition/questionnaire-supportLink|5.2.0

A URL that resolves to additional supporting information or guidance related to the question.

element_id	types
Extension
Extension.extension
Extension.url
Extension.value[x]	uri
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	uri