For example, if a component presents a list of data items, it may broadcast a property representing the name of the currently selected item.
例如，如果一个组件包含一系列数据条目，那么它可以向外传播一个代表当前选择的条目名称的属性。
On the backend, the data model is coupled with the property broker to broadcast changes to values in the data model and to listen for changes imposed from other component views.
在后端，数据模型与属性代理连接起来，以将更改传递给数据模型中的值，并监听来自其他组件视图的更改。
This method also clears the submittedValue property of each EditableValueHolder component so the form's data can be restored to the data from the map, ignoring any submitted data.
此方法还清除了每个 EditableValueHolder 组件的 submittedValue 属性以便表单数据能恢复成地图数据，同时忽略所有的提交数据。
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