Defining a key on a RTF inside a Template

I am creating  a key inside a template with RTF as
below:
<xsl:variable name="projectSum">
        <xsl:for-each select="//project">
                <xsl:variable name="projectname" select="./@name"/>
                <xsl:variable name="projectid" select="@id"/>
                <xsl:variable name="projectref"
select="projectelement/@ref"/>
                <xsl:copy>
                        <xsl:copy-of select="./@name"/>
                        <xsl:copy-of select="./@id"/>
                        <projectsum>
                                <xsl:copy-of
select="count(key('ProjectPartNumber',$projectref))"/>
                        </projectsum>
                </xsl:copy>
        </xsl:for-each>
</xsl:variable>

<xsl:key name="countDetail"
match="exslt:node-set($projectSum)/projectsum"
use="./@id"/>

In XALAN it throws error with message "Incorrect place
of defining Key".
I am not sure whether it is possible to create a key
with RTF within a template?
If not possible, is there any otherway to achive the
same functionality?

regards,
Ranjan



                
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