a safer way is to use a global param, this prevents a static type error
(as the system can not know that you will not pass in a node) but if you
never do pass in a value then teh run time behaviour is as you wish:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="foo" select="()"/>
<xsl:template name="x">
<xsl:for-each select="(1, 2, 3)">
<xsl:choose>
<xsl:when test=". instance of node()">
<xsl:apply-templates select="$foo,." />
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="."/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
$ saxon9 -it x stst.xsl
<?xml version="1.0" encoding="UTF-8"?>123
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