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manvolnum — A reference volume number
manvolnum ::= (#PCDATA|acronym|emphasis|trademark|link|olink|ulink|anchor|remark|subscript|superscript|inlinegraphic|inlinemediaobject|indexterm|beginpage)*
               In a DocBook reference page, the ManVolNum holds
               the number of the volume in which the RefEntry belongs.
               
            
               The notion of a volume number is historical.  UNIX manual pages (“man
                     pages”), for which RefEntry was devised, were typically
               stored in three ring binders.  Each bound manual was a volume in a set
               and contained information about a particular class of things.  For
               example, volume 1 was for user commands, and volume 8 was for administrator
               commands.
               
            
Volume numbers need not be strictly numerical; volume “l” frequently held manual pages for local additions to the system, and the X Window System manual pages had an “x” in the volume number: for example, 1x.
                  The content of ManVolNum is usually printed in parentheses
                  after the element title or citation.
                  
               
The following elements occur in manvolnum:
                  acronym, anchor, beginpage, emphasis, indexterm, inlinegraphic, inlinemediaobject, link, olink, remark, subscript, superscript, trademark, ulink.
               
<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<para>
For a further description of print formats, consult the
<citerefentry><refentrytitle>printf</refentrytitle>
<manvolnum>3S</manvolnum></citerefentry> manual page.
</para>For a further description of print formats, consult the printf(3S) manual page.
For additional examples, see also
               citerefentry, refentry.