Add attribute to root node

I have a quite simple question but I am doing somethings wrong. How can
I just add a schema association attribute to the root node of a
document?

When I do this no attribute will appear.

        <xsl:template match="/">
                <xsl:copy>                      
                        <!-- add association to general kiwi validator
xsd -->
                        <xsl:attribute
name="xsi:noNamespaceSchemaLocation">
                                <xsl:value-of select="$validator-url"/>
                        </xsl:attribute>

                        <xsl:copy-of select="@*"/>
                        <xsl:apply-templates />
                </xsl:copy>
        </xsl:template>

Robert

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