Mindmap layout

I would like to reproduce a mindmap using graphviz.

Creating mind map

I would like to create a mind map with Graphviz.
The mind maps must follow these guidelines:
1) The main node is in the center of the graph
2) Most secondary nodes are made of a word and a line passing under.
3) The edge must connect to a secondary node either on one end or another of its line.
4) Edges must not overlap nodes, and other edges if possible.
For a visual example, FreeMind produce mind maps following these guidelines.

2) I have not found any node that has this shape. Is creating a shape using Postscript the only option left?

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