| http://www.w3.org/ns/prov#value | - a video decoder unit for decoding an inputted MPEG II transport stream, and separately outputting a user data for caption and an MPEG II video data; an ATV caption command decoder unit for decoding the user data separated in the video decoder unit, and outputting a data including a caption command and a caption text; a user interactive control unit for sensing an interactive data inputted from the
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