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The following pages detail the DDI profile of the DDI implementation CLOSER has or will adopt. It lists all the DDI fields in use and gives a description of how they are used. It also lists whether fields are repeatable or not and whether they are required or not. These do not always match the DDI Lifecycle standard overall. Fields considered optional in DDI Lifecycle are required in CLOSER, for example, to ensure a consistent experience for users. In no case, however, does the CLOSER profile break the rules of DDI Lifecycle. This is up to date for DDI Lifecycle 3.2.