A content-type is the top-level media type used to declare the general type of data. A subtype is used to convey a specific format for that type of data. For example, a media type of “image/xyz” indicates that the data is an image, even without knowledge of the specific image format “xyz”.
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.