Re: Problem with obtaining distinct values from a variable containg a no

Sorry Andrew Welch for my vagueness, but initially I thought it was a
rather simply problem that could be solved using the parameter name
only. Here are the details

This is a .Net project.  (So no simple 2.0  distinct() available)We can
thank Microsoft later.

I populate a XslArgumentList  with a parameter "services" using a
NodeIterator 
        System.Xml.XPath.XPathNavigator nav = serv.CreateNavigator();
        
xslArgs.AddParam("services","",(System.Xml.XPath.XPathNodeIterator)
nav.Select("//MDBServiceDesc"));

Now the in the xslt I have 

<xsl:param name="services" />
Which would contain:

<MDBServiceDesc>
        Activity By Region
</MDBServiceDesc>
<MDBServiceDesc>
        Activity By Vendor
</MDBServiceDesc>
<MDBServiceDesc>
        Best Practices
</MDBServiceDesc>
<MDBServiceDesc>
        Capital Needs Assessment
</MDBServiceDesc>
<MDBServiceDesc>
        Financial Impact
</MDBServiceDesc>
<MDBServiceDesc>
        Financial Impact
</MDBServiceDesc>
<MDBServiceDesc>
        Financial Impact
</MDBServiceDesc>

I am currently using "not", as I believe using "!=" as suggested earlier
would always return true ?
<xsl:for-each
select="$services[not(preceding-sibling::MDBServiceDesc=.)]">
  Do something
</xsl:for-each>

I get the required list output, but still containing the duplicates.

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