本技术报告提供了关于可选地使用部门或国家扩展的指导方针，并结合欧洲规范对电子发票的核心要素的语义数据模型，包括在实际环境中应用的方法

This Technical Report describes how trading partners may extend the core invoice model and the related business rules and code lists, in order to support business cases that are specific to their trading environment, while at the same time maintaining semantic interoperability with the core invoice model. This Technical Report does not define a methodology for creation of core invoice usage specification, nor does it describe the detailed process of syntax binding.