Revenue bonds: The city shall have the power to borrow money
for the purpose of constructing, purchasing, improving, extending
or repairing of public utilities, recreational facilities or any other
self-liquidating municipal function not prohibited by the Constitution
and the laws of the State of Texas, and to issue revenue bonds to
evidence the obligation created thereby. Such bonds shall be a charge
upon and payable from the properties, or interest therein pledged,
or the income therefrom, or both. The holders of the revenue bonds
shall never have the right to demand payment thereof out of monies
raised or to be raised by taxation. All such bonds shall be used in
conformity with the laws of the State of Texas and shall be used only
for the purpose for which issued.