Dear Experts,

I got stuck with the following problem and need your help.

What I wnat to do is to get a set of distinct nodes.
Before the distinct I have selected the multiple occourences already
sucsessfully. However , the rest does not work as expected.

Hope someone can help on that.
Rolf

############################### DATA ################################

My XML DATA:
<?xml version="1.0" encoding="UTF-8"?>
<Root>
	<TEST>
		<Pin  PinName="A" />
		<Pin  PinName="B" />
		<Pin  PinName="B" />
		<Pin  PinName="C" />
		<Pin  PinName="X" />
	</TEST>
	<TEST>
		<Pin  PinName="A" />
		<Pin  PinName="D" />
		<Pin  PinName="C" />	
		<Pin  PinName="X" />
		<Pin  PinName="A" />
	</TEST>
</Root>


My Test XSLT:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
	<xsl:output method="text"/>
	<xsl:variable name="NewLine" select="'&#x0d;&#x0a;'"/>
	
	<xsl:variable name="TestNodes" select="Root/TEST"/>
	<xsl:variable name="MultiplePins"  select="$TestNodes/Pin[@PinName =
preceding::Pin/@PinName]"/>
	<xsl:variable name="UniqueMultiplePins" 
select="$MultiplePins[@PinName != preceding::*/@PinName]"/>

    <xsl:template match="/">
        <xsl:value-of select="concat('all pins of all test nodes ==>
OK ',$NewLine)"/>
		<xsl:for-each select="$TestNodes/Pin">
			<xsl:value-of select="concat(@PinName,$NewLine)"/>
		</xsl:for-each>	
		<xsl:value-of select="$NewLine"/>
		
		<xsl:value-of select="concat('multiple pins  ==> OK ',$NewLine)"/>
		<xsl:for-each select="$MultiplePins">
			<xsl:value-of select="concat(@PinName,$NewLine)"/>
		</xsl:for-each>
		<xsl:value-of select="$NewLine"/>
		
		<xsl:value-of select="concat('unique pins ==> NOT GOOD !!
',$NewLine)"/>
		<xsl:for-each select="$UniqueMultiplePins">
			<xsl:value-of select="concat(@PinName,$NewLine)"/>
		</xsl:for-each>
		
    </xsl:template>
   
</xsl:stylesheet>

My results (gained by XMLSpy debug mode):

all pins of all test nodes ==> OK 
A
B
B
C
X
A
D
C
X
A

multiple pins  ==> OK 
B
A
C
X
A

unique pins ==> NOT GOOD !! 
B
A
C
X
A

( I expected B A C X )
#################### End #################################