<xsl:template match="foo">
<xsl:copy-of select="."/>
</xsl:template>
<xsl:template match="foo[not(text()]">
<foo>hello mum</foo>
</xsl:template>
will convert
<foo>zzz</foo> to <foo>zzz</foo>
and
<foo/> to <foo>hello mum</foo>
David
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