title: What does &(0,1) mean in jolt transformation?
body: <p><a href="http://jolt-demo.appspot.com/" rel="nofollow">Here (click Convert 'prefix soup', to nested data item)</a> is example of translating prefix json into nested json.</p>
  
  <p><strong>Interesting string is</strong></p>
  
  <pre><code>"rating-*": "SecondaryRatings.&amp;(0,1)"
  </code></pre>
  
  <p>I understand that <code>*</code> is regular expression for keys, <code>&amp;</code> somehow refer to value, but what does <code>(0,1)</code> mean in <a href="https://github.com/bazaarvoice/jolt" rel="nofollow">jolt</a>?</p>