本文件规定了一组压缩编码规则，可用于推导建议ITU-T X.680 | ISO/IEC 8824-1中定义的类型值的传输语法。这些压缩编码规则还将被应用于解码这种传输语法，以便识别正在传输的数据值
本文档中指定的编码规则:
–在交流时使用
–用于在选择编码规则时主要考虑最小化值表示的大小的情况下使用
–对于建议ITU-T X.680 | ISO/IEC 8824-1中描述的所有扩展形式，允许通过添加额外值来扩展抽象语法，保留现有值的编码
–可根据建议ITU-T X.695 | ISO/IEC 8825？6的规定进行修改。

This document specifies a set of Packed Encoding Rules that may be used to derive a transfer syntax for values of types defined in Rec. ITU-T X.680 | ISO/IEC 8824-1. These Packed Encoding Rules are also to be applied for decoding such a transfer syntax in order to identify the data values being transferred.
The encoding rules specified in this document :
– are used at the time of communication;
– are intended for use in circumstances where minimizing the size of the representation of values is the major concern in the choice of encoding rules;
– allow the extension of an abstract syntax by addition of extra values, preserving the encodings of the existing values, for all forms of extension described in Rec. ITU-T X.680 | ISO/IEC 8824？1;
– can be modified in accordance with the provisions of Rec. ITU-T X.695 | ISO/IEC 8825？6.