Standard&Poor's Ratings Services raised its underlying rating (SPUR) on Orange County, Fla.'s tourist development tax bonds one notch to 'A+' from 'A', reflecting the strong management of the revenue stream, strong reserve levels, and continued diversity of the local economic base. The outlook is stable. At the same time, Standard&Poor's assigned its 'A+' rating to the county's series 2007 and 2007A tourist development tax refunding revenue bonds. The 'A+' rating reflects the county's: Strong, underlying economic base, anchored by the city of Orlando, a major tourist destination; Good debt service coverage (DSC) of future maximum annual debt service (MADS); Strong pledged revenue growth; and Adequate legal provisions. Offsetting factors include a vulnerability of tourist development tax