For purposes of interpreting the rules of origin set out in this Annex:
(a) the specific rule, or specific set of rules, that applies to a particular heading, subheading or tariff item is set out immediately adjacent to the heading, subheading or tariff item;
(b) a rule applicable to a tariff item shall take precedence over a rule applicable to the heading or subheading which is parent to that tariff item;
(c) a requirement of a change in tariff classification applies only to non-originating materials; and
(d) the following definitions apply:
chapter means a chapter of the Harmonized System;
heading means the first four digits in the tariff classification number under the Harmonized System;
section means a section of the Harmonized System;
subheading means the first six digits in the tariff classification number under the Harmonized System; and
tariff item means the first eight digits in the tariff classification number under the Harmonized System as implemented by each Party.