Doubly linked tree data structure

• Subject: Doubly linked tree data structure
• From: Ronnie O <email@hidden>
• Date: Fri, 29 Jul 2005 11:11:44 -0500
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Can anybody give an idea of what a doubly linked tree data structure
is??  This is the terminology used in the DragNDropOutlineView in the
documentation.  I am mostly interested in the doubly linked aspect.  I
don't understand why two classes are written in the same file.  For
what reason is this done?  Thanks!
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