I want links about specifying basic protocols well. Im making multiplayer game and need to specify the communication between server and client and would like to do some reading before since i suspect a poor soloution will haunt me. XML comes to mind but pressed for space and dont want to force my users to install parser. Many thanks for any information/idea/links.
example to server: shoot [myId] [targetId] [weaponused]
example from server: youvebeenshot [shooterId] [shooterWeapon] [current hitpoints]