OVID is a video-object database system that was designed and implemented to address challenges in defining attributes and querying video data using traditional object-oriented database models. The key ideas of OVID include using a schema-less description of the database, inheritance based on interval inclusion, and representing video objects in a composition hierarchy. OVID represents video objects as central units that can be dynamically and incrementally identified and defined. It also allows composition of video objects and supports ad-hoc querying of video objects and their attributes.