Yeh, it's not related, but I had to write a similar line for the new metadata part, and it felt clumsy to me as it was. A set is by definition unordered, so talking about the preceding identifiers is non-sensical. I'm perhaps being to literal, but this is a specification after all. I'm not married to it in either case, it's just a suggestion and need not be included with the rest of the content.