Constant ALTO_CDNI_JSON 

pub const ALTO_CDNI_JSON: Mime;

[RFC9241]

let media = mime2::application::ALTO_CDNI_JSON;
assert_eq!(media.ttype, "application");
assert_eq!(media.subtype, "alto-cdni+json");
assert_eq!(media.to_string(), "application/alto-cdni+json");