Check that the media types of representations are predefined.
检查表示的媒体类型是否是预定义的。
In order to build an integrated view, those different types of representations need to be mapped to the common view.
为了构建集成视图，需要将这些不同类型的表示形式映射到公共视图中。
To sum up, for a RESTful application, the contract contains three different pieces: the uniform interface, media types of representations, and contextual links to resources.
总而言之，对于RESTful应用来说，契约包含三个不同部分：统一接口、表示的媒体类型和资源的上下文相关链接。
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