gt; /
    |          |      /
    |          |     /
    |          |    /  Case
    |          |   /
    |          |  /
    |          | /
    |          |/
    |          o
    |          X
    |
    | Figure 1.  Basic Structure &amp; Terminology

wmj: What is A, I, D, ¤ ? How this subgraph is connected to XYZ graph?
Probably this is explained in your other submissions or figures. Classical
case of logically joined but physically dis-joined.

WMJ

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