A valid XML document, in addition to being well formed, conforms to all the constraints imposed by a Schema. It does not contain any tags that are not permitted by the schema, and the order of the tags conforms to the schema’s specifications.
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Advanced Television Systems Committee, Inc.
1300 I Street NW, Suite 400E
Washington, DC 20005
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.