Texas Government Code - GOV'T § 1371.103. Security for Obligation

(1) the proceeds from the sale of other obligations;

(2) the proceeds from the sale of revenue bonds payable from the revenue to be received from a public works or a specified user of a public works;

(3) any revenue that the issuer is authorized by the constitution, a statute, or the charter of a home-rule municipality to pledge to the payment of an obligation;

(4) a credit agreement;  or

(5) any combination of those sources.

(1) the sources permitted by this chapter;  and

(2) ad valorem taxes to the extent the project cost relates to an eligible project financed or to be financed with obligations payable from ad valorem taxes.