DPF: example

<html>
  <head>
    <title>GPS location example</title>
    <script type="text/javascript">
    <![CDATA[
      SystemEnvironment.location.format="zip code";
      SystemEnvironment.location.updateFrequency="20s";
    ]]>
    </script>
    <script defer="defer" type="text/javascript" 
      ev:event="se:locationUpdate">
      <![CDATA[
        var field = document.getElementById("location");
        var zipcode = SystemEnvironment.location;
        field.childNodes[0].nodeValue = zipcode;
      ]]>
    </script>
  </head>
  <body>
    <h2>Track your location as you walk</h2>
    <p>Your current zip code is: <span id="location">(please
    wait)</span></p>
  </body>
</html>

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