is the 放送者 interface for sending "approveUpdate" and "updated" events.
Description
明示するs a (form) 構成要素 which is bound to a data source.
The interface 供給するs the 可能性 of committing its 各々の
data to a data source it is bound to. A commit will be
成し遂げるd by the 環境 (usually, a FormController).
For example, suppose you have a data-bound 支配（する）／統制する that is connected
to a database field. Each time the 支配（する）／統制する loses its 焦点（を合わせる）, the
model (構成要素) of the 支配（する）／統制する is 誘発する／引き起こすd by the 環境
to 蓄える／店 its value in the database field.
