Dear Christian,

you actually describe things different from what I wanted to have ( and 
to implement). I have experienced a lack of node without incoming edges, 
which are still a part of the common hierarchy (and of the map layout), 
but can be optically used as headings, notes etc. Such nodes can not be 
obtained just by switching of their colors to the background, because of 
the following reasons:

* They must not be visible on clouds,
* they must not be visible if they cross other node's background, icons 
texts etc

If one wants to make them always present, they should be just started at 
the root position. In order to see their parent node, such edges have to 
be displayed if the the node where it comes in are selected.

The invisible edges as I see them are flexible, easy to implement and do 
not require any significantly new model elements. They are very high 
efficient. That's why I would like to implement them ASAP.

Regards, Dimitry

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