If there is a XPath expression to match elements by whether they have any text
content or not which would be better:

<xsl:template match="header">
  <header>
    <xsl:apply-templates select="all address* children with content" />
  </header>
  <xsl:if test="count(all address* children without content) &gt; 0">
    <errorDescription>
      <xsl:value-of select="all address* children without content" />
    </errorDescription>
  </xsl:if>
</xsl:template>

Any ideas if such an XPath exists?

Cheers,
Wendell