Using XSLT to copy all nodes in XML, with support for special cases

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<!--Identity template, 
        provides default behavior that copies all content into the output -->
    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <!--More specific template for Node766 that provides custom behavior -->
    <xsl:template match="Node766">  
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
            <!--Do something special for Node766, like add a certain string-->
            <xsl:text> add some text </xsl:text>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>