Sec. 55.17. PLEDGES; PARIETAL RULES; TYPES OF FEES; ADDITIONAL PLEDGE OF RESOURCES; ACQUISITION, ETC. OF PROPERTY; REVENUE BONDS. (a) Each board may pledge all or any part of its revenue funds to the payment of the bonds, including the payment of principal, interest, and any other amounts required or permitted in connection with the bonds. The pledged revenue funds shall be fixed and coll