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From Wiki.zanox.com

zanox Web Services Version 2009-02-01_RC01 introduced support of the Dynamic Script Tag Pattern. Here you can learn what it is, how to do cross domain requests to the zanox Web Services.

Usage of 'callback=function' with static script tag

Example: A product search against the product feeds of the programme with the ID 12345.

<script src="http://api.zanox.com/json/2009-02-01/products?applicationid=abc..&programs=12345&q=searchString&callback=myCallbackHandler"> </script>
<script>
  function myCallbackHandler(jsonData){
  //do something with jsonData, which is the result of the API query
  }
</script>

Usage of 'callback=function' with dynamic script tag

<script>
  function callAPI(url){
    var script = document.createElement('script');
    script.src = url; // sets the scripts source to the Rest/JSON API query
    script.type = "text/javascript";
 
    document.getElementsByTagName('head')[0].appendChild(script); 
    // the browser performs a request to the zanox API. 
    // as soon as the script tags source is loaded, the callback function is called
    }
 
    function myCallbackHandler(jsonData){
    //do something with jsonData, which is the result of the API query
    }
  }
  var url = 'http://api.zanox.com/json/2009-02-01/products?applicationid=abc&programs=12345&q=searchString&callback=myCallbackHandler';
  callAPI(url);
</script>