build_id_method - hmmm. Needed for error messages hashes by id.
build_label_method : Used in non-rendering messages, etc.
--- all these transforms will be renamed ---
default_method
inflate_method
deflate_method
inflate_default_method
deflate_value_method
validate_method

--- put in renderer? ---
wrap_label_method
trim
render_filter/html_filter
