bridgepoint/oal.py
def p_navigation_step_1(self, p):
        '''navigation_step : ARROW identifier LSQBR identifier RSQBR'''
        p[0] = NavigationStepNode(key_letter=p[2],
                                  rel_id=p[4],
                                  phrase=None)
def p_navigation_step_1(self, p):
        '''navigation_step : ARROW identifier LSQBR identifier RSQBR'''
        p[0] = NavigationStepNode(key_letter=p[2],
                                  rel_id=p[4],
                                  phrase=None)
navigation_step : ARROW identifier LSQBR identifier RSQBR