title: Equivalent of !Ref in aws cdk
body: <p>I am currently using aws-cdk to generate a cloudformation template and I would like to access a parameters defined with</p>
  
  <pre class="lang-py prettyprint-override"><code>CfnParameter(self, id="Platform", type="String", default="My Platform")
  </code></pre>
  
  <p>with a reference (Like <code>!Ref Platform</code>  in a cloudformation template)</p>
  
  <p>Any of you know what is the equivalent of a Ref in the aws cdk. </p>
  
  <p>Here is the yaml equivalent of the parameter I defined above</p>
  
  <pre><code>Parameters:
    Platform:
      Type: String
      Default: "My Platform"
  </code></pre>