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。

youdao

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。

youdao

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。

youdao