constant

constant — A programming or system constant.

Synopsis

constant ::=

Zero or more of:
- text
- replaceable
- Graphic inlines
  - inlinemediaobject
- Indexing inlines
  - indexterm (db.indexterm.endofrange)
  - indexterm (db.indexterm.singular)
  - indexterm (db.indexterm.startofrange)
- Linking inlines
- Ubiquitous inlines
  - abbrev
  - acronym
  - alt
  - anchor
  - annotation
  - 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

Attributes

Common linking attributes.

Attributes:

class (enumeration)
- “limit”

Description

A constant identifies a value as immutable. It is most often used to identify system limitations or other defined constants.

Processing expectations

Formatted inline.

Attributes

Common linking attributes.

any attribute

Any attribute in any other explicit namespace

class

Identifies the class of constant

Enumerated values:
“limit”	The value is a limit of some kind

Parents

These elements contain constant: bridgehead, caption (db.html.caption), citation, citetitle, classsynopsisinfo, computeroutput, contrib, emphasis (db.emphasis), entry, enumitemdescription, firstterm (db.firstterm), funcsynopsisinfo, glosssee, glossseealso, glossterm (db.glossterm), initializer, link, literallayout, member, meta (db.meta.content), olink, orgdiv, para, phrase (db.phrase), primary, primaryie, programlisting, quote (db.quote), refdescriptor, refentrytitle, refname, refpurpose, remark, screen, secondary, secondaryie, see, seealso, seealsoie, seeie, seg, segtitle, simpara, subtitle, synopsis, synopsisinfo, td, term, termdef, tertiary, tertiaryie, th, title, titleabbrev, tocentry, userinput.

Children

The following elements occur in constant: text, abbrev, acronym, alt, anchor, annotation, 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, replaceable, subscript, superscript, trademark, wordasword, xref.

Examples

1 |<article xmlns='http://docbook.org/ns/docbook'>
  |<title>Example constant</title>
  | 
  |<para>In ACL, <constant>main::PCS</constant> contains the path component
5 |separator character.
  |</para>
  | 
  |</article>

In ACL, main::PCS contains the path component separator character.

1 |<article xmlns='http://docbook.org/ns/docbook'>
  |<title>Example constant</title>
  | 
  |<para>The maximum legal length for a path name is 
5 |<constant class='limit'>PATH_MAX</constant>, defined in
  |<filename class='headerfile'>limits.h</filename>.
  |</para>
  | 
  |</article>

The maximum legal length for a path name is PATH_MAX, defined in limits.h.