How to get the different values of an element with xsl:for-each?

Hello,

I think that must be pretty silly, but I don't know how to solve it!

I have an XML document like this:
<DOC>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>
</DOC>

I try to obtain the different values of "ELEMENT" of the document, in this case should be just "A", but I don't know how to do it with a sentence like this:
<xsl:for-each select="DOC/NODE/ELEMENT"></xsl:for-each>

THANKS A LOT!!!!!
Pablo.

xml ::
-----------
<?xml version="1.0"?>
<DOC>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>

<NODE>
<ELEMENT>B</ELEMENT>
</NODE>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>
<NODE>
<ELEMENT>B</ELEMENT>
</NODE>
<NODE>
<ELEMENT>A</ELEMENT>
</NODE>

<NODE>
<ELEMENT>C</ELEMENT>
</NODE>
<NODE>
<ELEMENT>D</ELEMENT>
</NODE>
</DOC>

---------

xsl: code
-----------
<?xml version="1.0"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xslutput method="html" indent="yes" encoding="utf-8" omit-xml-declaration="yes" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"/>
<!-- $Revision: 1.5 $ -->
<xsl:key name="NodeKey" match="/DOC/NODE" use="."/>
<xsl:template match="/">



<xsl:for-each select="/DOC/NODE[count(. | key('NodeKey', .)[1]) = 1]">
<xsl:sort order="asend" select="."/>
<xsl:value-of select="."/>
<br/>
</xsl:for-each>

</xsl:template>
</xsl:stylesheet>









=========


with regards
niha

Thanks a lot niha! It does exactly what I want!

You can see it as an on-going work in:
URL

Thankyou!!!