The reference in article 4, paragraph 2, to article 18, a provision that includes a specific clause on restrictions in its paragraph 3, indicates that the permissibility of restrictions is independent of the issue of derogability.
第四条第二款中提到第十八条，后者在其第三款中特别包括一个关于限制的规定，其中指出是否允许限制是独立于是否可以克减的问题。