API4KP11 — The definition of knowledge, of which concept is a subclass, needs work

The current definition is much more specific than desirable - there should be a general notion of knowledge, of which concept and 'body of knowledge' (or some equivalent term) should be subclasses. If we do this, then mapping the API4KP and MVF ontologies would be much cleaner.

The relationship between body of knowledge and concept should then be clarified as well.