3.6.3 Implementation responsibilities

In addition to the restrictions implied by naming conventions, an entry may list additional explicit restrictions. These explicit restrictions usually describe both the programmer’s responsibilities, who must ensure that the subforms of a form are appropriate, or that an appropriate argument is passed, and the implementation’s responsibilities, which must check that subform adheres to the specified restrictions (if macro expansion terminates), or if the argument is appropriate.

A description may explicitly list the implementation’s responsibilities for some arguments or subforms in a paragraph labeled “Implementation responsibilities”. In this case, the responsibilities specified for these subforms or arguments in the rest of the description are only for the programmer. A paragraph describing implementation responsibility does not affect the implementation’s responsibilities for checking subforms or arguments not mentioned in the paragraph.