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.