title: Differences between rdf:resource, rdf:about and rdf:ID
body: <p>What are the conceptual differences between <code>rdf:resource</code>, <code>rdf:about</code>, and <code>rdf:ID</code>. I did some investigation but the difference between them are not clear for me yet. For example, whether <code>rdf:ID</code> is used when declaring a resource for the first time, <code>rdf:resource</code> is used for referencing an already existing resource, etc.</p>
  
  <p>I would be glad if you provide some little examples.</p>