Distinct list problem

Hi,

I'm trying to get a list of id's where each id is represented once out of
the xml below. Is it possible? The stylesheet below gives me:

20
21 - 20
21
20 - 21
22
21 - 22
20 - 22 - 21
21
20 - 21

So I get what I want, but then on anchestor based distinct. And not for all
attributequalitiy elements in the document. Should I make use of the msxml
nodeset function to construct a intermediate nodeset?

The ouput I want is:

20
21
22

Many thnx
Grt Henk Meulekamp


//-----------------------xsl

<xsl:variable name="attributes"
select="/root/page/ATTRIBUTES/CONTRACT//ATTRIBUTEQUALITY"/>

<xsl:for-each select="$attributes[not(@IDTESTTYPE =
preceding-sibling::ATTRIBUTEQUALITY/@IDTESTTYPE)]">
	    <br/>run -<xsl:value-of select="@IDTESTTYPE"/>
		<xsl:for-each select="preceding-sibling::ATTRIBUTEQUALITY">
			- <xsl:value-of select="@IDTESTTYPE"/>
		</xsl:for-each>	
</xsl:for-each>     

'//----------------------xml

<CONTRACT IDCONTRACT="2" CCONTRACTNUMBER="1.1" CPRODUCT="JORISTEST"
DECQUANTITY="1000.000" CUNIT="MT"> 
<DELIVERY IDDELIVERY="1" NUMLOADINGASSIGNMENT="1" IDTESTREPORT="2">
  <ATTRIBUTEQUALITY IDTESTTYPE="20" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  </DELIVERY>
<DELIVERY IDDELIVERY="2" NUMLOADINGASSIGNMENT="1234" IDTESTREPORT="1">
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="20" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="20" /> 
  </DELIVERY>
<DELIVERY IDDELIVERY="4" NUMLOADINGASSIGNMENT="4" IDTESTREPORT="20">
  <ATTRIBUTEQUALITY IDTESTTYPE="22" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="20" /> 
  </DELIVERY>
<DELIVERY IDDELIVERY="6" NUMLOADINGASSIGNMENT="6" IDTESTREPORT="23">
  <ATTRIBUTEQUALITY IDTESTTYPE="21" /> 
  <ATTRIBUTEQUALITY IDTESTTYPE="20" /> 
  </DELIVERY>
</CONTRACT>

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