@staticmethod
def is_multivalue(field_name):
    """
        Check, if given form field is a multivalue field.

        :param str field_name: Name of the form field.
        :return: ``True``, if the field can contain multiple values, ``False`` otherwise.
        :rtype: bool
        """
    if field_name in ('groups', 'severities', 'types'):
        return True
    return False
