Yes, those are the correct pads and discs, I have the same model Xantia.
I've used Mintex pads and discs in the past on this car and found them to be very good. That's a good price for quality pads and discs too, wish that offering had been around six months ago when I did my front brakes.
Do remember that the caliper pistons must be turned at the same time as being pushed back into caliper body.
The 110 bhp Xantia whether estate or hatchback uses the 288mm diameter disc. It's worth measuring the discs you receive because some motor factors/dealers have been known to incorrectly state that the 283mm dia. disc is for the 110.