Guide to Using SSIM Introduction Principles & Rules Message Composition Message Header Schedule Information Data Line(s) Additional Schedules Information (optional) Message Footer SCR (Request) Message Examples New Slot Request Delete Slot Request Change Slot Request SCR (Reply) Message Examples Reply Possibilities to a New Request Reply Possibilities to a Delete Request Reply Possibilities to a Change Request Responding to Offers SIR Message Action Codes Action Codes to be Used by Operator Action Codes to be Used by Coordinator Service Types Glossary of Terms