本文件规定了一组基本编码规则，这些规则可用于推导使用Rec.ITU-T X.680 | ISO/IEC 8824-1、Rec.ITU-T X.681 | ISO/IEC 8824-2、Rec.ITU-T X.682 | ISO/IEC 8824-3和Rec.ITU-T X.683 | ISO/IEC 8824-4中规定的符号定义的类型值的传输语法规范，统称为抽象语法一或ASN。1.这些基本编码规则也适用于解码这种传输语法，以便识别正在传输的数据值。它还指定了一组规范的、可区分的编码规则，这些规则将值的编码限制为基本编码规则提供的一种备选方案。

This document specifies a set of basic encoding rules that may be used to derive the specification of a transfer syntax for values of types defined using the notation specified in Rec. ITU-T X.680 | ISO/IEC 8824？1, Rec. ITU-T X.681 | ISO/IEC 8824-2, Rec. ITU-T X.682 | ISO/IEC 8824-3, and Rec. ITU-T X.683 | ISO/IEC 8824-4, collectively referred to as Abstract Syntax Notation One or ASN.1. These basic encoding rules are also to be applied for decoding such a transfer syntax in order to identify the data values being transferred. It also specifies a set of canonical and distinguished encoding rules that restrict the encoding of values to just one of the alternatives provided by the basic encoding rules.