There was an old UML diagram created at the time of the first draft.
It is integrated into the »OutputSlot« page in TiddlyWiki. This description
and the diagram are highly relevant for understanding the design in this case.
Unfortunately, Umbrello was "improved" with a lot of features since I used it
for the last time, but the **quality** of the software has been **degraded**,
it is now buggy and the layout is imprecise and gets messed up easily.
__Warning__: the old diagrams look ''slighly off alignment'',
this is very likely due to some change in font handling.
I have set the default font now to 'DejaVu Sans Condensed' 9pt
BoUML was close sourced by its author and consequently dropped
from Debian. We use UML as a drawing and documentation tool,
and thus we'll just start over with the /obvious/ choice,
which is the Umbrello tool.
Remove some orphaned diagrams and PNG images not actually used
in the TiddlyWiki. Add a page with some hints regarding Bouml
See also #960 -- Bouml has been discontinued and is closed source now
not sure how to proceed with this