449cabcb_asters_______Google_Developers__Required_
[Tag] dcterms:valid [Description] The publication and expiration date of the video. Full specification of dcterms:valid. Example: start=2002-10-13T09:00+01:00; end=2002-10-17T17:00+01:00; scheme=W3C-DTF [Required?] 
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Alternate Markups for Videos   |   Webmasters   |   Google Developers