DALLAS (Standard&Poor's) Aug. 15, 2012--Standard&Poor's Ratings Services assigned its 'AAA' long-term rating to Austin, Texas' nearly $141.2 million series 2012A public improvement bonds, series 2012B taxable public improvement bonds, series 2012 certificates of obligation, and series 2012 public property finance contractual obligations. Standard&Poor's also assigned its 'AA+' long-term rating to Mueller Local Government Corp., Texas' approximately $16.8 million series 2012 tax increment contract revenue bonds, issued on behalf of the city. At the same time, Standard&Poor's Ratings services affirmed its 'AAA' rating on the city's general obligation (GO) debt outstanding. We also affirmed our 'AA+' rating on the city's existing appropriation debt. The outlook on all ratings is stable. "The rating reflects