The babel language page does in fact list SML, but no specific ob- package is mentioned -- as if support is "built-in." And ob-sml -- at least in my elpa listing -- says only

Requires: sml-mode-6.4

Summary: org-babel functions for template evaluation

I was confused by the summary. I did install it and it works, BTW.

On Wed, Sep 23, 2015 at 2:10 PM, Ista Zahn <istazahn@gmail.com> wrote:

I don't understand. You see ob-sml, but you ask if there is no
support? From the looks of it, ob-sml provides babel language support
for Standard ML, no?

Best,
Ista

On Wed, Sep 23, 2015 at 9:21 AM, Lawrence Bottorff <borgauf@gmail.com> wrote:
> Is there no babel language support for Standard ML? I see a ob-sml at elpa.
> . .
>
> LB