"Trygve Reenskaug" <trygver at ifi.uio.no> wrote in message

> The most important phenomena occur in the space between the objects, so
> I don't think method annotations would help (since they apply to one
> method at the time).

Like a collaboration? Could one use:
    A>>m1
        <collab: #c1 role: #r1>
        <collab: #c2 role: #r1>
    A>>m2
        <collab: #c2 role: #r2>
    B>>m3
        <collab: #c1 role: #r3>

Could be done in Traits as well.

Thanks for sharing your insights. I was expecting the newer (non-class) 
structure diagrams to be on your list :-)

Sophie