取消并替换第三版（1986年）。指定用于字符集编码的8位代码和7位代码的结构。此处指定的代码旨在用于按正向顺序处理的数据。在以其他方式处理的数据串中使用这些代码，或在为固定长度记录处理而格式化的数据中使用这些代码，可能会产生不良结果，或者可能需要额外的特殊处理，以确保正确解释。

Cancels and replaces the third edition (1986). Specifies the structure of 8-bit codes and 7-bit codes which provide for the coding of character sets. The codes specified here are designed to be used for data that is processed sequentially in a forward direction. Use of these codes in strings of data which are processed in some other way, or which are included in data formatted for fixed-length record processing, may have undesirable results or may require additional special treatment to ensure correct interpretation.