@Override
 protected void nodeCopyPaste(BasicNode child) throws IOException {
   CoreEntity e = child.getEntity();
   if (e instanceof Mark) {
     Mark.getEM().getNew((Mark) e, getEntity());
     return;
   }
   throw new LogicException(
       "MarkRoot Entity does not have a child of the requested class ("
           + e.getClass().getSimpleName()
           + ")");
 }
 @Override
 protected void nodeCutPaste(BasicNode child) throws IOException {
   CoreEntity e = child.getEntity();
   if (e instanceof Mark) {
     Mark f = (Mark) e;
     f.getParent().removeMark(f);
     getEntity().addMark(f);
     return;
   }
   throw new LogicException(
       "MarkRoot Entity does not have a child of the requested class ("
           + e.getClass().getSimpleName()
           + ")");
 }