Sec. 6.06. APPROVAL AND REGISTRATION. (a) Bonds issued by the district and the records relating to their issuance must be submitted to the attorney general for examination as to their validity.

(b) If the attorney general finds that the bonds have been authorized in accordance with the law, the attorney general shall approve them, and the comptroller of public accounts shall register the bonds.

(c) Following approval and registration, the bonds are incontestable and are binding obligations according to their terms.