Type for order的意思|示意

The model USES a type hierarchy to leverage the similarities between items in an order, while still allowing for differences.

该模型使用类型继承来利用定制中项目间的相似性，当然照样允许有差别。

Two conditions need to be satisfied in order for serialization to happen: the serializer must be given a supported type and the object to be serialized must be non-null.

为使序列化能够发生，需要满足两个条件：必须为序列化器授予受支持的类型，并且待序列化的对象必须是非空的。

Note that type definitions for classes Order and Item appear in the schema, but type definitions for the subclasses of Item do not.

注意模式中有order及item类的类型定义，但是没有Item的子类的类型定义。

Take care to observe the rules for each extension type in order for them to work.

注意每种扩展类型的规则，以便它们能正常工作。

This is followed by notification of event occurrence to all listeners of the widget registered for that same event type and in the order in which the listeners were registered on widget.

然后发生该事件的通知会发送给控件中为该事件类型注册的所有监听器，发送顺序是这些监听器在控件上的注册顺序。

Select Order for the type.

选择order作为类型。