ISO 20022-4:2013是为了补充ISO 20022元模型，如ISO 20022-1:2013所述，ISO 20022注册机构将应用XML语法转换规则，以便将符合ISO 20022的消息定义转换为XML模式，用于XML消息的描述和验证。 它指定了从级别3到级别4的转换规则。这是一种确定性转换，意味着生成的XML模式对于给定的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 20022-4:2013 was prepared to complement the ISO 20022 Metamodel, as specified in ISO 20022-1:2013, with the XML syntax transformation rules to be applied by the ISO 20022 Registration Authority in order to translate an ISO 20022 compliant MessageDefinition into an XML Schema for the description and validation of XML Messages. It specifies the transformation rules from level 3 to level 4. It is a deterministic transformation, meaning that the resulting XML Schema 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.