它支持通用域名和国家代码域名。

It supports both generic domains and country code domains.

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字号一般不重要，但某些标准中在语言代码和国家代码组合中也规定了字号。

The type case is not important in general, but certain implementations specify a particular case for the combination of language code and country code.

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消息字段——这些元素由iso 8583标准定义，包含一些交易信息，如数量、日期、时间和国家代码。

Message fields — These elements are defined by the ISO8583 standard, and contain information about the transaction, such as amounts, dates, times, and country codes.

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