观点2：定制媒体类型如同契约，对于维护交互可视性是至关重要的。

Opinion 2: Custom media types are necessary to keep interactions visible, and to serve as contracts.

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为什么罗尔斯主张正义原则起源于一种类型的社会契约？

Why does Rawls represent principles of justice as originating in a kind of social contract?

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这使您可以在不同版本之间更改类型，前提是仍然遵守客户端与其流程之间的契约——更改类型可能意味着也要更改客户端。

This enables you to change types between different versions provided that the contract between clients and their process is still honored a "changing types can mean changing clients too."

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