First step is to include SoftXMLDB library into your HTML file:

<script language="javascript" src="SoftXMLDB.js"></script>

Now you can create SoftXMLDB object:

<script language="javascript">

  var DB = new SoftXMLDB();

</script>

You will need another two javascript libraries in order to get job done
<script language="javascript" src="json.js"></script>
<script language="javascript" src="SoftXMLLib.js"></script>

JSON - JavaScript Object Notation: this module helps to transfer object as string via Ajax responseText property so we can rebuild object on client.

SoftXMLLib: this module creates browser independent XMLHTTP and XMLDOM objects to enable client talk to server.