[SPEC] Backwards-compatible metadata in Gemini

[Stephane Bortzmeyer]

On Wed, Feb 24, 2021 at 10:11:07PM +0200,
 Lars Nood?n <lars.nooden at gmx.com> wrote 
 a message of 27 lines which said:

> The actual contents of the key-value pairs, the actual metadata itself,
> would not be part of the spec, not even the keys.

May be not in "The Official Spec" but it certainly needs to be
somewhere, because otherwise people would tag the same information
differently ("last-modified", "last-change", "updated"), then
destroying its utility. The OpenStreetMap example (you can invent new
tags but you should use the official ones, when relevant) is certainly
pertinent.

> It would not be appropriate to try to impose a custom vocabulary

Nobody imposes anything, Gemini has no armed forces.