Items are stored in the CA Harvest SCM repository. Each item in a repository consists of versions of the item. Projects use items to create versions on trunks of the delta tree that extend from the repository. These trunks can support versions on multiple branches. Branches are independent delta chains that extend from versions on a project trunk.
The following diagram depicts a single item that has been updated in multiple packages. The triangle represents a delta, or change, made to the original item since it was added to the repository. Each delta represents a new version.

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