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This is the identifier for the segment. For HTML
demarcations, the id provided in the source content would be used here. For
segments described with annotation, an identifier that is unique within the
segments on the page would suffice.
The uniqueness requirement is on the descriptor side. Within
the source content, multiple segments could have the same id. The implication
of this is that they share common specifications.
This sharing of identifier within the source content, does
not apply to segments that are being re-used (extended). See discussion on
extends attribute below.
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