Returns whether the parameter is optional or required
        :return: Return True if optional, False if required

def is_optional(self):
        """
        Returns whether the parameter is optional or required
        :return: Return True if optional, False if required
        """
        if (('optional' in self.attributes and bool(self.attributes['optional'].strip())) and
                ('minValue' in self.attributes and self.attributes['minValue'] == 0)):
            return True
        else:
            return False