  We present a suggestion on the interpretation of canonical time evolution
when gravitation is present, based on the nonlinear gauge approach to gravity.
Essentially, our proposal consists of an internal-time concept, with the time
variable taken from the dynamical fields characteristic of the nonlinear
realization of the internal time-translational symmetry. Physical time
evolution requires the latter symmetry to be broken. After disregarding other
breaking mechanisms, we appeal to the Jordan-Brans-Dicke action, conveniently
interpreted, to achieve that goal. We show that nontrivial time evolution
follows, the special relativistic limit being recovered in the absence of
gravity.
