Different types of domain concepts
  1. domain entity (dm-entity)

  2. It corresponds to noun Dm-concept. It can be further classified into user-concept, system-concept, and ordinary entity-concept.
     
  3. domain action (dm-action)

  4. It corresponds to verb Dm-concept
     
  5. domain quality (dm-quality)

  6. It describes quality associated with dm-objects and dm-actions.
    For example, in "he gently pushed the bell", "gently" is a dm-quality to "push" dm-action.
Two domain concepts will be judged as identical if they share the same name and type.