-This extension introduces the *obsolete* concept. It adds a new *obsolete*
-relation between two changesets. A relation ``<changeset B> obsolete <changeset
-A>`` is set to denote that ``<changeset B>`` is new version of ``<changeset
+This extension introduces the *obsolete* concept. The relation
+``<changeset B> obsoletes <changeset A>`` denotes that ``<changeset B>``
+is a new version of ``<changeset A>``.
-The *obsolete* relation act as a **perpendicular history** to the standard
-changeset history. Standard changeset history versions files. The *obsolete*
-relation versions changesets.
+The *obsolete* relations act as an history **orthogonal** to the regular
+changesets history. Regular changesets history versions files. *Obsolete*
+relations version changesets.
:obsolete: a changeset that has been replaced by another one.
:unstable: a changeset that is not obsolete but has an obsolete ancestor.
-:suspended: an obsolete changeset with unstable descendant.
-:extinct: an obsolete changeset without unstable descendant.
+:suspended: an obsolete changeset with unstable descendants.
+:extinct: an obsolete changeset without unstable descendants.
(subject to garbage collection)
Another name for unstable could be out of sync.