[see the tklib CVS repository if you don't see this module in your version]

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http://tcllib.sourceforge.net/doc/draw_diagram.html

Here is a quote from the manpage (as found in the CVS respository):

The Diagrams package is meant to help drawing diagrams, like flowcharts. The philosophy is that you should be concentrating on the contents of the diagram, rather than the exact positioning and sizing of all items within it.

[add info on what this is, how it works, screen image of what it looks like, whatever]

Focus seems to be on managing and keeping consistent the items in the diagrams, rather than (the higher level problem of) layout.

Drawing Diagrams may be related to this package

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