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drawing DAGs

I would like to draw DAGs in CLIM; that is: real DAGs where each node
occurs only once.

Though Genera's CLIM documentation describes
"clim:format-graph-from-root" behaving such way, in the example in the
User's Guide nodes are drawn two times though they are identical from
the LISP point of view. I assume that the :key parameter of the
function is not evaluated since an undefined function as argument does
not cause any error. Hence, there is no function that tries to find
identical nodes based on this parameter.

Has anybody fixed this problem?

- Bernd Bachmann
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