    | DocBook: The Definitive Guide 2.0.10 (Alpha) |
| | DocBook: The Definitive Guide 2.0.10 (Alpha) |
![[EBNF]](figures/rev_ebnf.png)
constraint$Revision: 1.3 $
$Date: 2002/06/12 11:18:07 $
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 |