On Mon, Apr 27, 2020, 4:35 AM tsuucat <tsuucat@icloud.com> wrote:

> tsuucat <tsuucat@icloud.com> writes:
>
>>> Yes, the convention is now to have downcased keywords.
>> Thanks. Is the convention documented?
>>
>> https://orgmode.org/manual/Structure-Templates.html#Structure-Templates <https://orgmode.org/manual/Structure-Templates.html#Structure-Templates>
>> It doesn’t seems that The Org Manual uses such a convention.
>
> While the manual doesn't recommend which you should prefer (I don't
> think), it does provide a rationale for its use of uppercase:
>
>    (info "(org)Conventions")
>    <https://yhetil.org/orgmode/87zhlhhwdo.fsf@nicolasgoaziou.fr/>

Hmm…
According to etc/ORG-NEWS, org-tempo.el was introduced in Org 9.2.
Unfortunately the section doesn’t refer the change of convention.

Why the convention is changed in org-tempo?

I'm a bit hazy about this, but I believe that org-tempo got introduced after this commit: https://code.orgmode.org/bzg/org-mode/commit/13424336a6f30c50952d291e7a82906c1210daf0

This was a few years ago. There was even a discussion thread on this list that showed preference to make that change. 

https://lists.gnu.org/archive/html/emacs-orgmode/2017-10/msg00449.html