code: static public DataTypeFactory<?> getInstance(String tname) {
          DataTypeFactory<?> factory = factories.get(tname);
          
          if( factory == null ) {
              throw new InvalidAttributeException("Unknown type name: " + tname);
          }
          return factory;
      }
docs: Provides access to the data type factory associated with the specified type name.
  @param tname the name of the data type for the desired factory
  @return the factory representing the specified type name
  @throws InvalidAttributeException when an unknown type is sought out