optional

optional — Optional information.

Synopsis

optional ::= [-]

Description

The optional element indicates that a specified argument, option, or other text is optional. The precise meaning of “optional” varies according to the application or process being documented.

Processing expectations

Formatted inline.

Parents

These elements contain optional: bridgehead, citation, citetitle, emphasis (db.emphasis), entry, firstterm (db.firstterm), glosssee, glossseealso, glossterm (db.glossterm), line, link, literallayout, member, olink, orgdiv, para, phrase (db.phrase), primary, quote (db.quote), remark, secondary, see, seealso, simpara, subtitle, term, termdef, tertiary, title, titleabbrev.

Children

The following elements occur in optional: text, abbrev, acronym, alt, anchor, biblioref, coref, date, emphasis (db._emphasis), firstterm (db._firstterm), footnote, footnoteref, foreignphrase (db._foreignphrase), glossterm (db._glossterm), indexterm (db.indexterm.endofrange), indexterm (db.indexterm.singular), indexterm (db.indexterm.startofrange), inlinemediaobject, link, olink, phrase (db._phrase), quote (db._quote), remark, subscript, superscript, trademark, wordasword, xref.

See Also

computeroutput, constant, literal, markup, option, parameter, prompt, replaceable, tag, userinput, varname

Examples

<article xmlns='http://docbook.org/ns/docbook'>
<title>Example optional</title>

<synopsis>
ls <option>-abcCdfFgilLmnopqrRstux1</option>
   <optional>names</optional>
</synopsis>

</article>

ls -abcCdfFgilLmnopqrRstux1
   names
Last revised by Norman Walsh on (git hash: 8efbb30ec1f2a59299576c057927c2032216aea4 f2da477a142b88c50ef9ceb6f54ce6b54fca5836)