CSA Preface 

Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the SCC Mirror Committee (SMC) on ISO/IEC Joint Technical Committee 1 on Information Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO member body for Canada and sponsor of the Canadian National Committee of the IEC. For brevity, this Standard will be referred to as "CSA ISO/IEC 8825-3" throughout. This Standard supersedes CAN/CSA-ISO/IEC 8825-3:16 (adopted ISO/IEC 8825-3:2015). The International Standard was reviewed by the CSA TCIT under the jurisdiction of the CSA Strategic Steering Committee on Information and Communications Technology and deemed acceptable for use in Canada. This Standard has been formally approved, without modification, by the Technical Committee and has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. 

Scope 

This Recommendation | International Standard defines a notation for specifying encodings of ASN.1 types or of parts of types. It provides several mechanisms for such specification, including: 

- direct specification of the encoding using standardized notation; 

- specification of the encoding by reference to standardized encoding rules; 

- specification of the encoding of an ASN.1 type by reference to an encoding structure; 

- specification of the encoding using non-ECN notation. 

It also provides the means to link the specification of encodings to the type definitions to which they are to be applied. ECN does not currently provide any support for specifications using the OID internationalized resource identifier type or the relative OID internationalized resource identifier type (see Rec. ITU-T X.680 | ISO/IEC 8824-1), and these are not referred to further in this Standard.