generate text for every descendant

My input is XHTML, and I want to generate a bit of text for every
descendant of the body element.  But my stylesheet generates the same
output as the default templates, which implies that my template never
matches:

<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet version="2.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="text"/>

<xsl:template match="body//*">
  <xsl:value-of select="concat('matched:', ., '&#x0A;')"/>
  <xsl:copy>
    <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
</xsl:template>

</xsl:stylesheet>

This is so simple, yet I'm completely frustrated.  What am I doing
wrong?

Thanks,
-- 
Kevin