A petition provided for in part 2 of this chapter or a resolution provided for in 13-28-301 for an election must:
(1) embrace only a single comprehensive subject;
(2) set out fully the ordinance sought, the ordinance to be amended and the proposed amendment, or the ordinance to be repealed;
(3) be in the form provided by this chapter; and
(4) contain transition provisions if the measure changes terms of office or forms of government.