Explicit clock temporal logic

The authors present a single exponent decision procedure for the validity of XCTL formulas, and a double exponent decision procedure for the validity of XCTL formulas over finite state programs (model checking). The expressive power of XCTL is compared with that of some other logics proposed for the expression of real time properties. It is shown that it is incomparable with the expressive power of the recently proposed logic TPTL (timed propositional temporal logic).<
>