Preview 2在之前的基础上增加了客户端验证，精简的Are a支持，以及抽象的数据标记(Data Annotations)验证和元数据提供者等功能。
Preview 2 builds on the features of Preview 1, adding client-side validation, streamlined support of Areas, and abstractions of data Annotations validation and metadata providers.
下表列出了元数据标记类型、每个标记类型表示的抽象以及包含该抽象元数据的元数据表的名称。
The following table lists the metadata token types, the abstraction that each token type represents, and the name of the metadata table that contains the abstraction's metadata.
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