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Introduction 
BitKeeper Concepts ChangeSets
In the documentation there are references to changesets and the ChangeSet file. A changeset is a grouping of related changes, and the medium for the exchange of data between BitKeeper repositories. The ChangeSet file is BitKeeper's metadata and is a record of all changesets which are in this repository. BitKeeper is unique in that the BitKeeper metadata is itself a revision controlled file, i.e., the metadata is versioned just like your data is versioned.
A changeset is created by a developer to group related changes. In this way changes for a bugfix or feature addition can have some meaning by being grouped together. This method of grouping changes allows the notion of tasked-based entities rather than just file-based entities.
By recording things that do change and things that don't change, BitKeeper can roll back to any changeset. In other systems, the tree must be tagged (or labelled) to roll back to that point. Unfortunately, it is often in hindsight that people want to do a tag. In BitKeeper, this is not a problem since it can roll back to any revision of the source tree at any time.
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