constraint
constraint — A constraint in an EBNF production.
Synopsis
constraint ::=
- empty
Attributes
Common attributes and common linking attributes.
No additional attributes.
Additional Constraints
- @linkend on constraint must point to a constraintdef.
Description
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).
Attributes
Common attributes and common linking attributes.
- any attribute
Any attribute in any other explicit namespace
Parents
These elements contain constraint: production.