| Attribute | att.canonical (@key, @ref) 
    | role | may be used to specify further information about the entity referenced by
this name, for example the occupation of a person, or the status of a place. | Zustand | Optional |  | Datentyp |  | 
 |  | nymRef | (reference to the canonical name) provides a means of locating the canonical form
      (nym) of the names associated with the object
       named by
      the element bearing it. | Zustand | Optional |  | Datentyp | 1–∞ Vorkommen von Durch Leerzeichen getrennt |  | Werte | One or more valid identifiers, separated by
      whitespace. | 
 |  |