thing_builder:

method_extractor:
  
attached_things_builder:
  
method build_thing:
    object: thing_builder
    method: build
    attach:
    - attached_things_builder

method build_default_thing:
    object: thing_builder
    method: build_default
    attach:
    - attached_things_builder
    - things_builder
    
things_builder:
  compose:
    - build_thing