title: Define extra properties for an existing class in RDFS?
body: <p>I want to create a RDFS schema about venue info which contains for example: </p>
  
  <p>address info and <code>xxx</code> info.</p>
  
  <p>I find another schema about it:<a href="https://schema.org/Place" rel="nofollow">https://schema.org/Place</a>. It contains more properties about address info but no info about <code>xxx</code>.</p>
  
  <p>So</p>
  
  <p><strong>Should I make my schema venue as a subclass of <a href="https://schema.org/Place" rel="nofollow">https://schema.org/Place</a>
  and add new properties?</strong></p>
  
  
  
  <pre class="lang-xml prettyprint-override"><code>  &lt;?xml version="1.0"?&gt;
  
      &lt;rdf:RDF
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:place="https://schema.org/Place#"
      xml:base="http://localhost:3000/VenueSchema#"&gt;
      &lt;rdfs:Class rdf:ID="Venue"&gt;
      &lt;rdfs:subClassOf rdf:resource="https://schema.org/Place"/&gt;
      &lt;/rdfs:Class&gt;
      &lt;rdf:Property rdf:ID="xxx"&gt;
          &lt;rdfs:domain rdf:resource= "#Venue"&gt;
          &lt;rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/&gt;
      &lt;/rdf:Property&gt;
  
      &lt;/rdf:RDF&gt;
  </code></pre>
  
  <p><strong>If I use subclass, does the venue automatically have properties from the <a href="https://schema.org/Place" rel="nofollow">https://schema.org/Place</a>?</strong></p>
  
  <p><strong>Or instead of subclassing, I should just reuse <a href="https://schema.org/Place" rel="nofollow">https://schema.org/Place</a> but declare extra properties for <a href="https://schema.org/Place" rel="nofollow">https://schema.org/Place</a>?</strong> Something like the following code:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0"?&gt;
  
  &lt;rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  xmlns:place="https://schema.org/Place#"
  xml:base="http://localhost:3000/VenueSchema#"&gt;
  
  &lt;rdf:Property rdf:ID="xxx"&gt;
      &lt;rdfs:domain rdf:resource= "https://schema.org/Place"&gt;
      &lt;rdfs:range rdf:resource="http://www.w3.org/2000/01/rdf-schema#Literal"/&gt;
  &lt;/rdf:Property&gt;
  
  &lt;/rdf:RDF&gt;
  </code></pre>