title: How to define custom object type in json-schema
body: <p>Suppose I have couple of objects like Vehicle and Computer. </p>
  
  <pre><code>{"brand":"Ford", "dateOfManufacture":"23/082015"}
  {"brand":"Apple", "dateOfManufacture":"23/082015"}
  </code></pre>
  
  <p>I know I can represent vehicle schema like below. However looking at schema doesn't tell me if its of Object type Vehicle or Computer. How can put that information in JSON.  Do json-schema provide custom type support . So instead of saying "type": "object" can I say "type": "vehicle".</p>
  
  <pre><code>{
      "description": "schema validating people", 
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
        "properties": { 
              "firstName": {"type": "string"}, 
              "lastName": {"type": "string"}
          }
     }
  }
  </code></pre>
  
  <p>TIA</p>