Straw-man for security parameter placement

[Rod Widdowson]

> In the interest of moving the missing pieces of the profile handlers
> along, I'll suggest we try this approach for handling the security
> parameter classes in the context tree. Most of this will be pluggable with
> lookup functions anyway.

[Snip]

It makes sense as much as I comprehend the problem and implementation space.
One thing that I did notice is that you are suggesting (I think) putting
Actions into Contexts.  I see nothing wrong with this, particularly given
the extensive use we make of Predicates and Functions, but it does feel just
a little bit weird to be mixing data and code (which, modulo syntax, is what
this is about).

I'm not saying that it's wrong, indeed it is pretty cute.  It just feels
weird.

Rod