[NTG-context] Collecting command arguments in a startstop environment

[Brooks Moses]

There's a nice little problem that arises in LaTeX, of wanting to write a 
bit of code like the following, to define an environment that passes the 
contents of the environment to a command as an argument:

  \newcommand{\foo}[1]{...}
  \newenvironment{fooenv}{%
    \foo\bgroup
  }{%
    \egroup
  }
There's even a nice FAQ entry about this. [1]  As it turns out, the amsmath 
package defines a handy [EMAIL PROTECTED] command that handles collecting the 
environment body to pass it to a command.

Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course 
replacing \newenvironment with \definestartstop.  Is there by any chance a 
built-in ConTeXt macro that can do this?  Or even things that would make a 
decent foundation for building such a thing?

Thanks much,
- Brooks
[1] http://www.tex.ac.uk/cgi-bin/texfaq2html?label=cmdasenv
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