(a) In this section, 'obligation' means a bond, note, lease-purchase agreement, or installment sale obligation of the district.(b) The principal amount of the district's obligations that are payable from assessments imposed by the district may be in an amount that does not exceed the aggregate appraised value of the property in the district, as established by an independent appraisal by a member of the Appraisal Institute.(c) The appraised value of the property in the district established for ad valorem tax purposes does not limit the principal amount of the obligations that may be issued by the district under Subsection (b).(d) The city is not required to pay the principal of and interest on an obligation issued by the district. Added by Acts 2009, 81st Leg., R.S., Ch. 1139 (H.B. 2619), Sec. 1.04, eff. April 1, 2011.