Lars Hellström <[log in to unmask]> writes:

>    lu   for upper and lower case,
>    su   for caps and small caps,
>    ll   for all lower case,
>    uu   for all upper case, and
>    ss   for all small caps.

I think "all uppercase" should either go into a separate axis or be
combined with the font encoding.

If lu, ll, uu are handled through the font encoding then it leaves only
small caps to be handled through the font shape. Something like
T1/.../.../sc for cap&small caps, T1L/.../.../sc for all small caps, and
T1U/.../.../sc identical to T1U/.../.../n.

In normal use only these three would be frequently used, I think:

  T1/.../.../n
  T1U/.../.../n
  T1/.../.../sc

although T1L/.../.../sc might be useful for acronyms.