A domain is a class or type and indicates the rules, syntax, and semantics for a piece of data (for example, it must be an integer, float, conform to a picture, and so on).

域是类或类型并表示数据的规则、语法及语义(例如，它必需是整型、浮点型、图片类型等等)。

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The <fmt:formatNumber> action determines from the locale, for example, whether to use a period or a comma for delimiting the integer and decimal portions of a number. Here is its syntax

<fmt:formatNumber> 操作由语言环境确定，例如，使用句点还是使用逗号来定界数字的整数和小数部分。

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The next installment in this series will cover more advanced topics, such as metaclass syntax, ABCs, decorators, integer literal support, base types, and exceptions.

本系列的下一期文章将会涵盖更高级的主题，比如元类语法、a BC、修饰符、integer literal支持、基类型和异常。

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