> I got the following error message:
>     DID NOT EXPECT cannot convert to node-set
> I hope this is just a problem in XT

No I think it's just a problem of semantics (if I may mention semantics
on this list, which is of course mainly concerned with style)

The error message means:

You didn't declare the parameter in the template.


<xsl:stylesheet 
  xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
  result-ns="">


<xsl:template name="Wrapper">
   <xsl:param-variable name="Content"/> <!-- ADDED THIS LINE -->
    <xsl:element name="W">
        <xsl:copy-of select="$Content"/>
    </xsl:element>
</xsl:template>

<xsl:template match="C">
    <xsl:call-template name="Wrapper">
        <xsl:param name="Content">
            <xsl:attribute name="B">b value</xsl:attribute>
        </xsl:param>
    </xsl:call-template>
</xsl:template>

</xsl:stylesheet>


applied to 

<C B="hello">
<xxx/>
c text
</C>


produces no error and this output
<W B="b value"/>

which is I think what you wanted?

David


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