This attribute indicates the status relating to a long-running
command handled by the ProvisioningSystem. It is usually
expressed as a percentage of the number of elements (for example,
components) processed with respect to the total set of elements that
need to be processed for that activity. Note that, one cannot assume
that the percentage implies how much time the task may still take.
The time to complete the activity is dependent on many things
which are beyond the control of the ProvisioningSystem itself.