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IBM Rational ClearCase 7.0: Master the Tools That Monitor, Analyze, and Manage Software Configurations by Tatiana Shpichko, Marc Girod

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Managing contributions

Back now to the issue of managing the contributions to a given version, that is, to identifying the contributing versions. During the merge, diffs (or deltas) have to be computed between every contributor and a common reference: the base contributor— typically the closest common ancestor, possibly one of the contributors.

The merge tool will use the version tree to compute a suitable version for the role of base, aiming at producing as small diffs as possible. For that purpose, beyond direct ancestry, special kinds of hyperlinks (between versions) will be used: instances of the Merge type. They will be created at the end of every merge, for use at the start of any later one. They may also be created and removed explicitly. ...

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