Supplemental

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In this section

Topic	Description
System.Supplemental.AlbumID	Contains the identifiers of the albums that the item is a member of. Can be used in conjunction with the Album item in the Content Indexer APIs to notify other apps about picture albums either the user created or apps have already created.
System.Supplemental.ResourceId	Contains the identifier for the item on the remote sync service. Used for comparing a file on the system to ones that are available in the cloud.