ISO 20022-8:2013描述了生成ASN的转换规则。1符合ISO 20022的消息定义的抽象语法。生成的抽象语法用于描述和验证消息。 转换规则是从3级到4级的转换。这是一种确定性转换，意味着最终的ASN。1对于给定的MessageDefinition是完全可预测的。转换本身既没有手动输入，也没有手动调整转换结果。 ISO 20022-8:2013是ASN。1等同于ISO 20022-4:2013。在ISO 20022-4:2013中，生成的抽象语法是XML模式；在ISO 20022中- 8:2013这是ASN。1.在ISO 20022-4:2013中，唯一支持的编码是UTF-8 XML；在ISO 20022-8:2013中，ASN支持多种编码。1.这些功能包括所有标准编码，但还包括在ECN中注册自定义编码的功能。

ISO 20022-8:2013 describes the transformation rules to generate ASN.1 abstract syntax from an ISO 20022 compliant MessageDefinition. The generated abstract syntax is for the description and validation of Messages. The transformation rules are a transformation from Level 3 to Level 4. It is a deterministic transformation, meaning that the resulting ASN.1 is completely predictable for a given MessageDefinition. There is neither manual input to the transformation itself nor manual adjustment to the result of the transformation. ISO 20022-8:2013 is the ASN.1 equivalent of ISO 20022-4:2013. In ISO 20022-4:2013 the abstract syntax generated is XML Schema; in ISO 20022-8:2013 it is ASN.1. In ISO 20022-4:2013 the only encoding supported is UTF-8 XML; in ISO 20022-8:2013 there are multiple encodings supported for ASN.1. These include all the standard encodings, but in addition the ability to register custom encodings in ECN.