<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <rect width="50" height="50" id="rect"/>
    <use id="use" xlink:href="#rect"/>
    <clipPath id="clip">
      <use xlink:href="#use" />
    </clipPath>
  </defs>

  <rect width="100" height="100" fill="green" />
  <g clip-path="url(#clip)">
    <rect width="100" height="100" fill="red" />
  </g>

  <text x="10" y="120">The graphic above should show a 100x100 green rectangle.</text>
   <text x="10" y="140">The red rectangle should not show since it uses a clipping path that uses an indirect reference.</text>
</svg>