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This is an example where for one bib record there are several items. One of the items is also linked to a different bib. So instead of creating a new instance record for the same item and having the item info in two different instance records (1 for the bib and 1 for the analytic bib), we can record the analytic information as part of the attributes on the item (refer to line # 80line# 80 in the analytics instance record.)
6. EBook
This represents instance record for an ebook. The URI information is recorded at the holdings level and doesn't have to be recorded at the item level.