Namespace = 'tree';
this[Namespace]
  ('draw_root')
  ('draw_child_nodes');

##

this.tree
  ('draw_root')
  ('draw_child_nodes');

##

this.tree()
  .draw_root()
  .draw_child_nodes();

##

this
  .tree('draw_root')
  .tree('draw_child_nodes');

##

$#tree
  .tree
    .draw_root
    .draw_child_nodes