In a development process items (parts or documents) are often refined incrementally, so one ItemVersion originates from another. The class ItemHistoryEntry enables the description of predecessor / successor relationships between ItemVersions. The description of both linear and branching relationships is possible. The relationship can be classified in order to distinguish between two cases:
- The successor ItemVersion is an instance of the same item (type = "Sequence")
- The successor ItemVersion is an instance of a new but somehow similar item (type = "derivation").