2.3 Meaning and Types of Compliance
Compliance to a given level entails full realization of all language units that are defined for that compliance level. This
also implies full realization of all language units in all the levels below that level. “Full realization” for a language unit at
a given level means supporting the complete set of modeling concepts defined for that language unit at that level.
Thus, it is not meaningful to claim compliance to, say, Level 2 without also being compliant with the Level 0 and Level
1. A tool that is compliant at a given level must be able to import models from tools that are compliant to lower levels
without loss of information.