announcement-the temporal query language tsql2 final language definition richard thomas snodgrass , ilsoo ahn , gad ariav , don batory , james clifford , curtis e. dyreson , ramez elmasri , fabio grandi , christian s. jensen , wolfgang k &#228; fer , nick kline , krishna kulkarni , t. y. cliff leung , nikos lorentzos , john f. roddick , arie segev , michael d. soo , suryanarayana m. sripada acm sigmod record