| http://www.w3.org/ns/prov#value | - The not-at-all could be overridden for life-threatening events such as tornadoes, etc.6) Dismissible graphic overlays - to show weather radar displays, etc. but only to those viewers that elect to see them (national or regional, real-time or near-real-time, low bandwidth video)7) Emergency video - again, this should be on a separate stream that is dismissible by those not affected.
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