| Description: |
specifies the classes of edges that are hidden. Edges that are within such a class are not laid out nor drawn. Nodes that
are only reachable (forward or backward) by edges of an hidden class are not drawn. However, nodes that are not reachable
at all are drawn. (But see attribute ignore.singles.) Specification of classes of hidden edges allows to hide parts of a graph,
e.g., annotations of a syntax tree. This attribute is only allowed at the outermost level. More than one settings are possible
to specify exactly the set of classes that are hidden. Note the important difference between hiding of edges and the edge
line style invisible. Hidden edges are not existent in the layout. Edges with line style invisible are existent in the layout;
they need space and may produce crossings and influence the layout, but you cannot see them.
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