As to the special taxes, licenses, fees, and other revenues classified as special revenues, as set out in this chapter, it is not the purpose of this chapter to levy or change the amount or rate of such taxes, licenses, fees, and other revenues, nor to change the purposes for which such special revenues are to be used as provided for by law. This chapter shall not be construed as amending any of the provisions of law with respect to such taxes defined to be special revenues except for the purpose of defining the purposes for which these revenues are raised and collected, which also shall include the services rendered by the constitutional and fiscal agencies in the manner provided by law.