Distinction between use and definition of a Concept should be made explicit.

[hanjoosten]

In the P-structure, we used to use a Text to identify a Concept. With the introduction of the first phase of namespaces, we decided to restrict the names of Concepts. Besides the restrictions, we added an optional LABEL.

This has some funny effects, which do not feel intuitive and/or logical. At all places where a P_Concept is used internally, one can now expect a label. A label should only be in te P_ConceptDef, not in the P_Concept. At the A-structure however, we need the optional label in the A_Concept.