ISO/IEC 23091系列定义了各种系统代码点和字段，这些代码点和字段建立了独立于压缩编码和比特率的多媒体流属性。这些属性可以描述解码多媒体数据的适当解释，或者类似地，可以描述在信号被适合于压缩这样的输入信号的编码器压缩之前，这样的信号的特性。 注:ISO/IEC 23091-1:2018规定了适用于ISO/IEC 23091系列任何部分的代码点的URN格式，并可在将来进行修订，以包含多媒体系统特有的代码点（与视频和音频相比）。

The ISO/IEC 23091 series defines various systems code points and fields that establish properties of a multimedia stream that are independent of the compression encoding and bit rate. These properties could describe the appropriate interpretation of decoded multimedia data or could, similarly, describe the characteristics of such signals before the signal is compressed by an encoder that is suitable for compressing such an input signal. NOTE ISO/IEC 23091-1:2018 specifies a URN format applicable to code points from any part of the ISO/IEC 23091 series, and could be revised in future to contain code points specific to multimedia systems (in contrast to video and audio).