> For EDTF Level 1 or 2, I propose we add fractional minutes and fractional hours
We could consider that, but let's then keep in mind that introducing
non-EDTF-level-zero ISO_8601 features in EDTF level one would modify what
have been considered the "border" between EDTF level zero and EDTF level one. At
we can read
> Level 0 may be considered a profile of 8601. Features in levels 1 and 2 are not currently supported by 8601.