pertain definition
pertain means “to have some connection with or relation to something.” Webster’s Third New International Dictionary, 1688
pertain in the context of Article X:1 means to "have reference or relation to; relate to"152. However, this should not mean that any matter, however distantly related, falls within the scope of Article X:1. The distinction should be made based on whether the relevant laws, etc., are relevant enough so that it can be seen to be directly relate to matters indicated in Article X:1. Therefore, whether rules governing the operational procedures of bodies that oversee or are somehow involved in the administration of customs laws pertaining to matters set out in Article X:1 should be determined in light of the content of such rule. If it sets out the details of how to implement trade regulations, then it may "pertain to" trade regulations set out in Article X:1. However, it is difficult to envision that the rules governing operational procedures of bodies is rules of "general application" as required under Article X:1.
pertain or "pertaining" means commenting upon, comprising, consisting of, concerning, reflecting, relating to, referring to, describing, constituting, relevant to, or evidencing, and should be construed in the broadest possible sense of the word.