title: SVG external reference without id
body: <p>I have a simple SVG file with the contents like this <code>(icon.svg)</code>:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; viewBox=&quot;0 0 512 512&quot;&gt;
      &lt;path d=&quot;...&quot;/&gt;
  &lt;/svg&gt;
  </code></pre>
  <p>How can I make an external reference for it without adding an <code>id</code> attribute? Something like:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;svg&gt;
      &lt;use xmlns:xlink=&quot;http://www.w3.org/1999/xlink&quot; xlink:href=&quot;icon.svg&quot;&gt;&lt;/use&gt;
  &lt;/svg&gt;
  </code></pre>