code: public static boolean isValid(final String name) {
          if (name == null) {
              return true;
          }
          for (final FileOrder fo : INSTANCES) {
              if (fo.name.equals(name)) {
                  return true;
              }
          }
          return false;
      }
docs: Returns if an instance with a given name exists.
  
  @param name
  Unique name or NULL (returns also TRUE).
  
  @return If the name is known TRUE else FALSE.