Loads the given JSON information for this column.

        :param jdata: <dict>

def loadJSON(self, jdata):
        """
        Loads the given JSON information for this column.

        :param jdata: <dict>
        """
        super(ReferenceColumn, self).loadJSON(jdata)

        # load additional information
        self.__reference = jdata.get('reference') or self.__reference
        self.__removeAction = jdata.get('removeAction') or self.__removeAction