data_id (ATSC)
data_id is a 14-bit unsigned integer field that is the direct linkage between particular events in a Data Event Table (DET) entry or Aggregate Data Event table section (A/90) and an associated Event Extended Text table (EETT) or Aggregate Event Text table (AETT) section.
the union of event_id and data_id must be mutually exclusive unique within each three hour time period for every value of source_id.
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