#===2.0.4(2007-03-20): add xml type, can output without header
#===2.0.3(2006-08-23): modified in use
#===2.0.2(2006-08-17): fix tt bugs
#===2.0.1(2006-08-09): support TT
#===2.0.0(2006-08-03): release, add document