Set a rules as object attribute.

        Arguments:
            name (string): Rule name to set as attribute name.
            properties (dict): Dictionnary of properties.

def set_rule(self, name, properties):
        """
        Set a rules as object attribute.

        Arguments:
            name (string): Rule name to set as attribute name.
            properties (dict): Dictionnary of properties.
        """
        self._rule_attrs.append(name)
        setattr(self, name, properties)