overview.dot

digraph sourcetree
{
   rankdir = TD;
   node [ shape="box"; style="filled" ]
   "mulle-objc-developer"  [ fillcolor="yellow"]
   //  not inheriting from mulle-objc-developer
   "mulle-c-developer"     [ fillcolor="white"]
   "mulle-sde-developer"   [ fillcolor="white"]

   "mulle-objc-developer" -> "mulle-c-developer"  -> "mulle-sde-developer"
}