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Dear Rick Davies,
I haven't seen any answer, so I will suggest something that might work
(depending on the programming skills at hand and your audience) even if it
is not specifically designed for your need.
First, choose a drawing software with a whiteboarding feature: several users
can edit the same shared image live. Google docs does this, Inkscape too
(but I never tried the whiteboarding feature of Inkscape).
Both softwares can save the drawing as SVG, which is an xml file format.
Then you need to write a script that converts between SVG and your preferred
To ensure that the script works well, you also need to instruct your users
to use only a subset of the drawing capabilities of the software: how to
draw nodes, labels and links. Especially when drawing a link, it must
connect two already existing nodes (so that when a node is moved, the links
move too). Such links are called "connectors" in Inkscape.
Same caveat for the labels (in Inkscape, I would use groups). You might want
to enforce a predefined set of shapes and colors too.
This is far from perfect, but at least you now have one option ;-)
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