There is also extensibility to the schema in that you are able to add additional user attributes to the predefined entities.

还可以对此模式进行扩展，例如，您可以向预定义的实体添加其他用户属性。

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You can add validators on attributes, units, capabilities, and domains, and you can report the status to the model user as an informational message, warning, or error message.

您可以在属性，单元，功能与域上添加确认器，您可以向用户将状态报告为信息，警告或者错误信息。

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