title: standard for "loops" in XML?
body: <p>I am designing a simple XML file for animations. I often get in a situation that I write something like this:</p>
  <pre><code>&lt;frame&gt;
      &lt;image&gt;./image1.png&lt;image/&gt;
  &lt;/frame&gt;
  &lt;frame&gt;
      &lt;image&gt;./image2.png&lt;image/&gt;
  &lt;/frame&gt;
  &lt;frame&gt;
      &lt;image&gt;./image3.png&lt;image/&gt;
  &lt;/frame&gt;
  ...
  </code></pre>
  <p>Now, this of course can get annoying. So I hoped XML allowed something like this:</p>
  <pre><code>&lt;frameset min=1 max=5&gt;
      &lt;image&gt;./image#.png&lt;image/&gt;
  &lt;/frameset&gt;
  </code></pre>
  <p>Making # a placeholder for a counter variable.
  What I am wondering: is there already a standardized way of doing something like this?
  It just makes things easier if one uses methods people are already used to.</p>