[Tex/LaTex] Dependency graph with TikZ

graphicsgraphstikz-pgf

I would like to make a TikZ diagram to show the detailed
dependency structure of the theorems in my thesis with nodes
and subnodes. Ex:

Theorem 4               (A)
   coding theorem       (A1)
       proof techniques (A1a) 
   converse             (A2)

Theorem 5               (B)

and then indicate that there is a dependency

(A1a) --> (B)

which is more precise than saying that
Theorem 5 depends on Theorem 4. More
specifically, this is what I am trying to draw:

enter image description here

Is there a TikZ package for that?
Or for drawing .deb dependency graphs?

I found one package/framework for course prerequisites:
http://www.texample.net/tikz/examples/prerequisite-chart/
but the underlying format is very low level
so you are meant to edit with a program.

All advice / example / recommendations will be much appreciated!

Best Answer

At http://latex-community.org/know-how/427-stemma-tikz last Thursday an interesting document was just translated from French to English. It is for manuscript analysis showing relationships between different manuscripts, authors, and texts. It is in the form a tutorial and I think this may be exactly what you want.

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