title: Does each object in the design play a conceptual role described in a domain model?
body: <p>Eric Evan's DDD book, pg. 49:</p>
  
  <blockquote>
    <p>Setting aside purely technical issues, each object in the design plays
    a conceptual role described in domain model.</p>
  </blockquote>
  
  <p>I think what author is saying is that all objects in the design ( besides predefined types such as <code>int</code>, <code>string</code> ... ) also exist as concepts in the domain. Wouldn't such assumption be wrong, since I would assume there may be objects in the design that don't exist in a domain model, but are instead used to <strong>help</strong> describe a domain object or implement its behavior?</p>
  
  <p>thanks</p>