[SPEC] Backwards-compatible metadata in Gemini

[Stephane Bortzmeyer]

On Mon, Feb 22, 2021 at 10:34:46AM +0000,
 Oliver Simmons <oliversimmo at gmail.com> wrote 
 a message of 36 lines which said:

> > * What about the value? Completely unstructured and therefore
> > unparsable? Your own example for "last-edited" is useless for programs
> > since it does not fit any known standard for dates.
> 
> last-edited was just a random example, I wasn't trying to propose keys
> or values.

My question still holds. Should values be unstructured or should we
have structured types (dates, datetimes, numbers, URIs, etc)?