标准摘要
[中文适用范围]： 本文档总结了现有文件格式和代码流（例如 ISO/IEC TR 19566-1 中指定的文件格式和代码流）可以以前向和向后兼容的方式进行扩展的机制。 [外文原描述]： This document summarizes mechanisms by which existing file formats and codestreams, such as those specified in ISO/IEC TR 19566-1, can be extended in a forward and backward-compatible way.
英文名称Information technology - JPEG Systems - Part 9: JPEG extensions mechanisms to facilitate forwards and backwards compatibility