title: KML change visibility of a folder with AnimatedUpdate in Google Earth
body: <p>In KML it's possible to change the visibility during a Tour with the AnimatedUpdate element for a single Placemark as shown below:</p>
  
  <pre><code>  &lt;gx:AnimatedUpdate&gt;
      &lt;gx:duration&gt;0.0&lt;/gx:duration&gt;
      &lt;Update&gt;
        &lt;targetHref/&gt;
        &lt;Change&gt;
          &lt;Placemark targetId="pin2"&gt;
            &lt;gx:balloonVisibility&gt;1&lt;/gx:balloonVisibility&gt;
          &lt;/Placemark&gt;
        &lt;/Change&gt;
      &lt;/Update&gt;
    &lt;/gx:AnimatedUpdate&gt;
  </code></pre>
  
  <p>How can I change the visibility of a complete folder?
  Alternatively, how can I change the visibility of a set of Placemarks with a "compact" AnimatedUpdate element?
  If possible, I'd like to avoid listing every single Placemark in the AnimatedUpdate element.</p>