    | DocBook: The Definitive Guide 2.0.17 (Alpha) |
| | DocBook: The Definitive Guide 2.0.17 (Alpha) |
![[EBNF]](figures/rev_ebnf.png)
constraint$Revision: 1666 $
$Date: 2002-06-12 07:19:37 -0400 (Wed, 12 Jun 2002) $
constraint — A constraint in an EBNF production
constraint ::= EMPTY
Name | Type | Default |
| linkend | IDREF | Required |
This element is only available if you are using the EBNF Module.
A Constraint is a cross-reference to a
description of a constraint that cannot be expressed in the grammar
(generally logical rather than syntactic constraints).
| | | |
| constant | | constraintdef |