20 Library introduction [library]

20.4 Method of description (Informative) [description]

20.4.1 Structure of each clause [structure] Elements [structure.elements]

Each library clause contains the following elements, as applicable:156
To save space, items that do not apply to a Clause are omitted.
For example, if a Clause does not specify any requirements, there will be no “Requirements” subclause.