The Media Object Server (MOS) protocol allows newsroom computer systems (NCS) to communicate using a standard protocol with video servers, audio servers, still stores, and character generators for broadcast production.[1][2]
The MOS protocol is based on XML.[3] It enables the exchange of the following types of messages:[4]
Descriptive Data for Media Objects.
The MOS "pushes" descriptive information and pointers to the NCS as objects are created, modified, or deleted in the MOS. This allows the NCS to be "aware" of the contents of the MOS and enables the NCS to perform searches on and manipulate the data the MOS has sent.
https://en.wikipedia.org/wiki/Media_Object_Server