title: Multiple properties to define same concept
body: <p>In RDF example sometimes I am finding different properties to define the same concept ex:</p>
  
  <pre><code>.addProperty(FOAF.name, "Archives, "en")
  .addProperty(RDFS.label, "Archives", "en")
  </code></pre>
  
  <p>What is the reason that this is done?</p>