Aveo 1.4LT 1.4D 1.4S Confused on maintenance schedules

sorry if this is posted in the wrong section Ive just bought a 09 Aveo 1.4 LT ive been looking at the service booklet to see whats required for the 30,000 service as the dealer only did an oil and filter change im confused as to what maintenance is required for this car in the service schedule it says 1.4D and 1.4S 1.2D what does the D and S stand for ? are they different models? I would like to know whats relevant for my car Please any ideas ?

diesel ? standard?

not sure which engines you have, I think you had a 8 valve and a 16 valve of the 1.4 correct? maybe that is the S designation?

The 1.4D is probably for the diesel engine that you can buy over there. The 1.4S is probably for spark ignition (gas engine).

Thank you for the answers simple when you know the answer =0)