This section would be meaningless if the chosen representation formats are not describable by a schema.

如果模式无法描述所选的表示格式，这部分将毫无意义。

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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).

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。

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This representation can be returned in a variety of formats: XML, JSON, PHP object, PHP array, or serialized string.

该表示可以各种格式返回：XML、JSON、php对象、php数组或序列化字符串。

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