code: public Object map(final Value message) throws ObjectToIdMappingException {
          final UUID valueId = message.getObservableObjectId();
          if (valueId != null) {
              return objectRegistry.getByIdOrFail(valueId);
          } else {
              return message.getSimpleObjectValue();
          }
      }
docs: Maps a {@link Value} message to the {@link Object} it describes.
  
  @param message
  the message to map
  @return The observed value
  @throws ObjectToIdMappingException
  When the value described it he message is unknown in the {@link MetaModel}.