The Material Exchange Format is aimed at the exchange of program material between file servers and is a format for tape streamers and digital archives. It usually contains one complete sequence but this may comprise a sequence of clips and program segments. MXF bridges file and streaming transfers, helping to move material between AAF file-based post production and streaming program reply using standard networks. The MXF body carries the content that can include MPEG, DV and uncompressed video and contains an interleaved sequence of picture frames, each with audio and data essence plus frame-based metadata.