Different types of domain concepts
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domain entity (dm-entity)
It corresponds to noun Dm-concept. It can be further classified into
user-concept, system-concept, and ordinary entity-concept.
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domain action (dm-action)
It corresponds to verb Dm-concept
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domain quality (dm-quality)
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.