Is there a way to determine whether a variable holds a string or a
node set? Something like:

<xsl:template name="my-template">
  <xsl:param name="arg"/>
  <xsl:choose>
    <xsl:when test="pseudo test: type($arg)='node-set'">Do something</xsl:when>
    <xsl:otherwise>Do something else</xsl:otherwise>
  </xsl:choose>
</xsl:template>

I'm looking for an XSLT 1.0 solution as I want it to work in browsers.

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/