Ahhh... I get it!!! 😍
So, my event would include, for instance, the `i` tag or `a` tag or whatever tag, that identified what I am rating, and the `d` tag would include a hash referring to that data, so that every time I replaced the rating (by changing the content from "Loved this book!" to "Wow, this book totally sucked." for instance), the relay would look for the same d-tag and switch them out.
And the client would use the other tag to figure out what I am trying to rate. And then I could rate anything for which there could be some sort of appropriate tag.
I think what confused me, and what you and nostr:npub12262qa4uhw7u8gdwlgmntqtv7aye8vdcmvszkqwgs0zchel6mz7s6cgrkj just clarified, is that there are actually two different things needed (a unique d-tag, so that the rating is replaceable), and a way to refer to something (so that the client can figure out what is being rated), and that these two things don't have to be within one tag.
You can use the normal i, a, t, whatever indexes for the second, and use any d-tag structure you want, for the first.
