public function getDefinitionRoleLocators( $roleRefsKey )
	{
		if ( ! isset( $this->definitionRoleRefs[ $roleRefsKey ] ) ) return array();
		$role = $this->definitionRoleRefs[ $roleRefsKey ];
		if ( strpos( $role['href'], $this->getTaxonomyXSD() ) === false )
		{
			return $this->getTaxonomyForXSD( $role['href'] )->getDefinitionRoleLocators( $roleRefsKey );
		}
		return isset( $role['locators'] ) ? $role['locators'] : array();
	}