d to the XSLT 2.0 <code>xsl:document</code> instruction.
It is used to direct output to a secondary output destination. It is available
only when the stylesheet specifies <emph>forwards-compatibility mode</emph>, that is,
when the <code>version</code> attribute on <code>xsl:stylesheet</code> or the <code>xsl:version</code>
element on a containing literal result element has a value other than <code>1.0</code> (The value
<code>1.1</code> is recommended but not strictly necessary).</p>

<p>Most of the a