1. NACE Rev. 2 shall include:
(a)
a first level consisting of headings identified by an alphabetical code (sections);
(b)
a second level consisting of headings identified by a two-digit numerical code (divisions);
(c)
a third level consisting of headings identified by a three-digit numerical code (groups); and
(d)
a fourth level consisting of headings identified by a four-digit numerical code (classes).
2. NACE Rev. 2 is set out in Annex I.