On Wed, 12 Aug 2009, Andreas Harder wrote:

> In the "real world“ I've stripped quotes form another document and stored 
> them in buffer-environments (attachment).

Save them as lua tables. Much easier to manipulate than tex objects.

> With your solution I've no idea how 
> to incorporate them in a "automatic" manner.

You just need to work a little harder.

\startbuffer[1]
This is a test
\stopbuffer

\startbuffer[2]
Another test
\stopbuffer

\startbuffer[3]
And again
\stopbuffer

\startluacode
   userdata = userdata or {}
   function userdata.shift(i)
     return "(" .. i .. "cm ," .. i .. "cm )"
   end

   function userdata.buffers(i)
     local idx = string.format("%s",i)
     local b = buffers.data[idx]
     if b then
       if type(b) == "table" then
         return table.concat(b)
       else
         return b
       end
     else
       return "unknown"
     end
   end

   function userdata.draw_buffer(i)
     return "draw btex " .. userdata.buffers(i) .. " etex  shifted ".. 
userdata.shift(i) .. ";"
   end
\stopluacode

\starttext


\startluacode

   context.startMPpage({offset = "1ex", width = [[\paperwidth]], height = 
[[\paperheight]]})
     for i = 1,3 do
       context(userdata.draw_buffer(i))
     end
   context.stopMPpage()
\stopluacode

\stoptext

Aditya