比如，类名可以定义成namespace_localname或者等价的表示。
For instance, the class names can be defined as namespace_localname or equivalent expressions.
如果用这种格式表示，清单1的等价形式如清单2所示。
The equivalent of Listing 1 in this format is as shown in Listing 2.
消息的XML表示是纯文本文件，因此它通常比其他格式(如分隔符、二进制或定制格式)的等价表示要大得多。
The XML representation of a message is a plain text file, so it is generally much larger than an equivalent representation in another format (such as delimited, binary, or custom formats).
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