本标准定义了SMPTE 377M第7节中针对交易所定义的操作模式3a和3b 表示以下文件复杂度级别的MXF文件:--OP3a:从一个或多个文件包中播放编辑列表的材料包，其中只有一个 文件包可在任何材料包时间表上的任何给定位置引用--OP3b:从两个或多个文件包中播放编辑列表的材料包，每个文件包可能 在材料包时间表上的任何给定位置进行参考和同步。在每种情况下，顶级文件包都链接到一个Essential容器，每个Essential容器都可以 包含单个要素或多个要素的交错。此外，在每个 在这种情况下，一个或多个essence容器可能位于文件内部或外部。本标准定义了操作限制、结构元数据对象和单独的属性 应适用于MXF文件格式规范，以在交换MXF文件时实现互操作性 使用这些操作模式。这些操作模式要求对内部精华容器使用身体分区。细分 每个使用主体分区的essence容器都是可选的。

This standard defines operational patterns 3a and 3b as defined in SMPTE 377M section 7 for the exchange of MXF files that represent the following levels of file complexity:--OP3a: A material package that plays out an edit list from one or more file packages where only a single file package may be referenced at any given position on any material package timeline.--OP3b: A material package that plays out an edit list from two or more file packages each of which may be referenced and synchronized at any given position along the material package timeline.In each case, a top-level file package is linked to an essence container where each essence container may comprise either a single essence element or an interleave of multiple essence elements. Furthermore, in each case, one or more of the essence containers may be internal or external to the file.This standard defines the operating restrictions, structural metadata objects, and individual attributes that shall be applied to the MXF file format specification to achieve interoperability when exchanging an MXF file with these operational patterns.These operational patterns require the use of body partitions for internal essence containers. Subdivision of each essence container by using body partitions is optional.