DocBook 5.2: The Definitive Guide  (Version 5.2.6 for DocBook 5.2b09a)


constraintdef — The definition of a constraint in an EBNF production.


constraintdef ::= [-]

Additional Constraints

  • If this element is the root element, it must have a version attribute.


A constraintdef contains a description of a constraint that cannot be expressed in the grammar (generally logical rather than syntactic constraints).

Processing expectations

Formatted as a displayed block.