ISO 15022的这一部分包括:-？增强的ISO 7775语法和消息设计规则的描述；-？证券报文增强型ISO 7775和EDIFACT字段词典的内容和组织；然后-？在增强型ISO 7775和EDIFACT语法中构建的证券消息目录的内容和组织。 它在必要时参考EDIFACT语法，以确保增强型ISO 7775概念和EDIFACT概念之间的轻松交叉引用。ISO 15022的这一部分没有描述EDIFACT语法；其在ISO 9735中定义，其通过引用并入。 ISO 15022的这一部分用于证券业参与者之间的电子数据交换，独立于通信网络。依赖于网络的规则，例如，关于如何指定消息的发送地点和时间、消息确认和消息保护不在ISO 15022这一部分的范围内。ISO 15022这一部分的维护在ISO 15022的第2部分中描述。

This part of ISO 15022 consists of:
-？ the description of the Enhanced ISO 7775 syntax and message design rules;
-？ the contents and organization of the dictionary of Enhanced ISO 7775 and EDIFACT fields for securities messages; and
-？ the contents and organization of the catalogue of securities messages built in the Enhanced ISO 7775 and EDIFACT syntaxes.
It refers to the EDIFACT syntax when necessary to ensure an easy cross-reference between Enhanced ISO 7775 concepts and EDIFACT concepts. The EDIFACT syntax is not described in this part of ISO 15022; it is defined in ISO 9735 which is incorporated by reference.
This part of ISO 15022 is used for electronic data interchange between securities industry participants, independently of the communication network. Network dependent rules, for example, on how to specify where and when the message is to be sent, message acknowledgement and message protection are outside the scope of this part of ISO 15022.
The maintenance of this part of ISO 15022 is described in part 2 of ISO 15022.