任意字符串值都可以加入资产的自定义属性中；但是，这个值只用于在 RAM 客户端中搜索和查看。

Any string value can be placed in the custom attribute on the asset; however, the value is for searching and view-only purposes in the RAM clients.

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JSON模式定义属性值可接受的类型。

JSON Schemas define the acceptable types for the values of properties.

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published 属性的值定义了发布事件的名称。

The value of the published attribute defines the name of the published event.

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