refentry.xref.manvolnum — Output manvolnum as part of refentry cross-reference?
manvolnum
refentry
<xsl:param name="refentry.xref.manvolnum" select="1"></xsl:param>
if true (non-zero), the manvolnum is used when cross-referencing refentrys, either with xref or citerefentry.
xref
citerefentry