本文件规定了EN 16931-1中包含的电子发票语义模型与UBL 2.1语法（ISO/IEC 19845）之间的映射。对于语义模型中的每个元素（包括子元素或补充组件，如标识方案标识符），定义语法中的哪个元素用于包含其信息内容。表示语义、格式、基数或结构之间的任何不匹配。

This document specifies the mapping between the semantic model of an electronic invoice, included in EN 16931-1 and the UBL 2.1 syntax (ISO/IEC 19845). For each element in the semantic model (including sub-elements or supplementary components such as Identification scheme identifiers) it is defined which element in the syntax is to be used to contain its information contents. Any mismatches between semantics, format, cardinality or structure are indicated.