A set of one or more that partially or sufficiently specify the meaning of a .
- The that specify a concept definition are represented in as or as OWL axioms that conform to the .
- Before July 2018, all were represented as .
- During a transitional period commencing with the July 2018 release of the , some in will be represented using the and at the end of the transitional period all will be represented in this way.
- will continue to be represented as .