本标准定义了IMF Essential组件，一种用于音频、图片和数据Essential交换的OP1a MXF结构。它定义了用于在网络或存储介质的信号接口处交换的数据结构，但没有定义兼容设备的内部存储格式或特定本质编码的映射。它还定义了元数据表达式，用于传达IMF Essence组件公式中允许的变化。

This standard defines the IMF Essence Component, an OP1a MXF structure for interchange of audio, picture and data essence. It defines data structures for interchange at the signal interfaces of networks or storage media, but does not define internal storage formats for compliant devices or mappings for particular essence encodings. It also defines metadata expressions used to communicate allowable variations in the formulation of an IMF Essence Component.