Spry Nested Datasets for each element

I am trying to make a website XML editor and I am using spry datasets and nested datasets to do this. However I have an XML file like this:

<Seating_Plan>
<Department id="A">
<DeptCode>001</DeptCode>
<DeptName>Test1</DeptName>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5<li>
</Department>


<Department id="B">
<DeptCode>002</DeptCode>
<DeptName>Test2</DeptName>
<li>6</li>
<li>7</li>
<li>8</li>
<li>9</li>
<li>10</li>
</Department>
</Seating_Plan>

And I have my HTML like this:

<script type="text/javascript">
var XML = new Spry.Data.XMLDataSet("../XML/XML.xml", "Seating_Plan/Person");
var XML_Dept = new Spry.Data.XMLDataSet("../XML/XML.xml", "Seating_Plan/Department");
var dslists = new Spry.Data.NestedXMLDataSet("../XML/XML.xml", "li");
</script>

<div spry:region="XML_Dept">
  <table width="95%" border="0" align="center" cellpadding="0" cellspacing="0">
    <tr class="XML_Container_Header">
      <th height="40">ID</th>
      <th>DeptCode</th>
      <th>DeptName</th>
      <th>Description</th>
      <th>lists</th>
    </tr>
    <tr spry:repeat="XML_Dept">
      <td><input id="ID_Dept" name="ID_Dept" type="text" class="textfields" value="{@id}" size="3" maxlength="3"></td>
      <td><input id="ID_Dept" name="ID_Dept" type="text" class="textfields" value="{DeptCode}" size="30" maxlength="30"></td>
      <td><input id="ID_Dept" name="ID_Dept" type="text" class="textfields" value="{DeptName}" size="50" maxlength="50"></td>
      <td><input id="ID_Dept" name="ID_Dept" type="text" class="textfields" value="{li}" size="50" maxlength="50"></td>
      <td spry:region="XML_Dept"><ul spry:repeatchildren="dslists"><li><input  id="ID_Dept" name="ID_Dept" type="text" class="textfields" value="{li}" size="50" maxlength="50"></li></ul></td>
    </tr>
  </table>

The first row is displayed correctly with the XML LI elements of Department "A", however the second row or Department B in the table has duplicated the Department "A" XML Li Elements, How do I get it to display the department B li elements removing the duplication...?

In other words:

Any ideas would be gratefully appreciated!!

Many thanks!

SPRYS are no longer supported, it is better to use JQUERY or Javascript from additional research. Also using PHP Forms to post the values works well for my needs.