标准摘要
[中文适用范围]： 本部分定义了一组用于标记规范向前兼容性的约定，不仅适用于本标准第1部分和第4部分描述的Office Open XML规范，还适用于其他标记规范。这些约定允许使用后来版本或扩展的应用程序创建的XML文档被早期版本的应用程序处理。 [外文原描述]： This Part of ISO/IEC 29500 defines a set of conventions for forward compatibility of markup specifications, applicable not only to Office Open XML specifications as described in Parts 1 and 4 of this Standard, but also to other markup specifications. These conventions allow XML documents created by applications of later versions or extensions to be handled by applications of earlier versions.
英文名称Information technology - Document description and processing languages - Office Open XML File Formats - Part 3: Markup Compatibility and Extensibility