Sorry if this is a double post; I sent this message on Friday, and I
think it somehow got lost.
In March/April 2002, Hans and Idris had an interesting exchange about
the topic "critical editions in context" here in ntg-context; the main
question was whether the functionality of edmac could be implemented in
context. I'd be curious to know whether anything came out of it, I
couldn't find any follow-up.