I need to insert a parent node on a node-set read by
URL.

<xsl:template match="ref">
  <xsl:variable name="content" select="document(@url)"/>
     <xsl:apply-templates select="$content"/>
</xsl:template>

The content variable may hold an element "f", in the template
for that, I need to match a parent - and not the implicit
document root.

<xsl:template match="f">
  <xsl:if test="parent::stuff">

  </xsl:if>
</xsl:template>

Can this be done by somehow creating the content variable in
another fashion?