systemitem — A system-related item or term.


systemitem ::=


Common attributes and common linking attributes.

Additional attributes:

  • At most one of:
    • class (enumeration)
      • “daemon”
      • “domainname”
      • “etheraddress”
      • “event”
      • “eventhandler”
      • “filesystem”
      • “fqdomainname”
      • “groupname”
      • “interface”
      • “ipaddress”
      • “library”
      • “macro”
      • “netmask”
      • “newsgroup”
      • “osname”
      • “process”
      • “protocol”
      • “resource”
      • “securitycontext”
      • “server”
      • “service”
      • “systemname”
      • “username”
    • All or none of:
      • class (enumeration)
        • “other”
      • otherclass (NMTOKEN)


A systemitem identifies any system-related item or term. The class attribute defines a number of common system-related terms.

Many inline elements in DocBook are, in fact, system related. Some of the objects identified by the class attribute on systemitem may eventually migrate out to become separate inline elements, and some inline elements may migrate into systemitem.

Processing expectations

Formatted inline.


Common attributes and common linking attributes.


Identifies the nature of the system item

Enumerated values:

A daemon or other system process (syslogd)


A domain name (


An ethernet address (00:05:4E:49:FD:8E)


An event of some sort (SIGHUP)


An event handler of some sort (hangup)


A filesystem (ext3)


A fully qualified domain name (


A group name (wheel)


A network interface (eth0)


An IP address (


A library (libncurses)


A macro


A netmask (


A newsgroup (comp.text.xml)


An operating system name (Hurd)


A process (gnome-cups-icon)


A protocol (ftp)


A resource


A security context (a role, permission, or security token, for example)


A server (


A service (ppp)


A system name (hephaistos)


A user name (ndw)


Identifies the nature of the non-standard system item


These elements contain systemitem: caption (db.html.caption), citetitle, computeroutput, emphasis, entry, html:button, html:label, html:legend, link (, literallayout, para, phrase (db.phrase), programlisting, quote, rddl:resource, subtitle, summary, td, term, th, title, titleabbrev, userinput.


The following elements occur in systemitem: text, inlinemediaobject, phrase (db._phrase), replaceable, subscript, superscript.

See Also

Related elements: computeroutput, filename, userinput.


 1 |<article xmlns=''
   |         xmlns:xlink=''>
   |<title>Example systemitem</title>
 5 |<para>For many years, O'Reilly's primary web server, 
   |<link xlink:href=""></link>,
   |was hosted by <application>WN</application> on
   |<systemitem class="systemname"></systemitem>.
10 | 

For many years, O'Reilly's primary web server,, was hosted by WN on