Instance Information for SDF

This document specifies instance-related messages to be used in conjunction with the Semantic Definition Format (SDF) for Data and Interactions of Things (RFC 9880). Split into four "archetypes", instance-related messages are always governed by SDF models, strictly separating instance and class information. _Context_ information plays a crucial role both for lifecycle management and actual device interaction. // This revision updates the base SDF reference to the recently // published RFC 9880, improves the terminology section, and applies // a bug fix to an example.