code: public static String getVersion(String variant) {
  
          Object data = getCalendarSystem(variant);
  
          if (data instanceof AstronomicalHijriData) {
              return AstronomicalHijriData.class.cast(data).getVersion();
          }
  
          return "";
  
      }
docs: /*[deutsch]
  <p>Bestimmt die Datenversion der angegebenen Kalendervariante. </p>
  
  <p>Diese Methode dient nur Analysezwecken. </p>
  
  @param   variant     name of islamic calendar variant
  @return  version info (maybe empty if not relevant)
  @throws  ChronoException if the variant is not recognized
  @since   3.9/4.6