If explicitly referenced, a condition-name must be unique or be made unique through qualification and/or subscripting.

If qualification is used to make a condition-name unique, the associated conditional variable may be used as the first qualifier. If qualification is used, the hierarchy of names associated with the conditional variable itself must be used to make the condition-name unique.

If references to a conditional variable require subscripting, reference to any of its condition-names also requires the same combination of subscripting.

In the general format of the chapters that follow, 'condition-name' refers to a condition-name qualified or subscripted, as necessary.