On 2013–04–17 Meer, H. van der wrote:

> Is there a reason why the first does switches off the rule above the footnote
>   \setupfootnotes[rule=off]
> but this doesn't?
>   \setupnotation[footnote][rule=off]]

It's \setupnotes, not \setupnotation that controls the rule.

\setupnotes
  [footnote]
  [rule=off]

\starttext
Some footnote\footnote{The foonote}.\crlf
\stoptext

Marco