Texas Government Code - GOV'T § 1504.003. Pledge of Revenue

(a) Bonds issued under this subchapter must be secured by a pledge of and be payable from all or a designated part of the revenue from the facility for which the bonds are issued or from additional sources made available by the municipality for that purpose, as provided in the ordinance authorizing or approving the issuance of the bonds.

(b) The pledge securing the bonds is inferior to any previous pledge of the revenue for the payment of revenue bonds or revenue refunding bonds that are outstanding.

(c) A municipality that leases as lessee a facility described by Section 1504.001 may pledge all or part of the revenue from the facility to the lease payments the municipality must make.