Nothing strange about XM pads. Remove the pad and wind the calliper piston back with large screwdriver or bar. This resets the handbrake mechanism so it can then take up the slack as the pads wear down.
Just a little unusual as the front brakes contain the handbrake. Nothing overly complicated, just treat as if you were doing the rear brakes on a normal car (i.e. you might need to enlist the help of a piston wind-back tool)
Does the caliper have to come off? There doesn't appear to be any way to slide the pads out. All the cars I've done have a spring plate and pin and the pads slide in from the back of the caliper...