[xsl] displaying unique entries in a list

Dear all,

Hope that you can help with this problem I have displaying a list of data.

My XML looks like this:

<xml>
<List>
	<Entry>
		<Session>2004/5</Session>
		<Department>Accounting and Finance</Department>
	</Entry>
	<Entry>
		<Session>2004/5</Session>
		<Department>Accounting and Finance</Department>
	</Entry>
	<Entry>
		<Session>2004/5</Session>
		<Department>Maths</Department>
	</Entry>
	<Entry>
		<Session>2004/5</Session>
		<Department>Maths</Department>
	</Entry>
	<Entry>
		<Session>2004/5</Session>
		<Department>Economic History</Department>
	</Entry>
</List>
</xml>

My xslt example is below:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/">
<html>
	<body>
		<h2>Test example of List output</h2>
		<hr/>
		 <!--########## Begin Main Document ##########-->
		 <xsl:apply-templates />
	</body>
</html>
</xsl:template>

<!--######## Template for Department Main table data ######-->
<xsl:template match="List">
	<table border="1" width="100%">
		<xsl:apply-templates select="Department"/>
	</table>
</xsl:template>

<!--### Displays first page departments only ###-->
<xsl:template match="Department">
  <xsl:for-each select="/List/Entry/Department[not(. =
preceding::Department)]">
            <tr>
              <td>
		   <span style="color:#000000">
			<a href=""><xsl:value-of select="." /></a>
		   </span>
	       </td>
            </tr>
  </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

An earlier posted fix in the xlst allowed me to display just single unique
entries in the html like this:

	Accounting and Finance
	Maths
	Economic History

However I now get multiples of these unique values rather than one single list
of the unique values.

Am I calling the template root incorrectly in the xslt?
Should I be using a loop of some sort to display the unique values only once?

Many thanks,


Mike

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