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Vocabulary
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.. note:: all terminology is subject to change

:obsolete marker:
    express a relation from 0..n new changesets to 1 old changeset
:obsolete changesets:
    non public changeset target of a obsolete marker

:unstable changeset:
    changeset not obsolete but with obsolete ancestor

:extinct changeset:
    obsolete changeset without unstable descendant

:suspended changeset:
    obsolete changeset with unstable descendant

:obsolete-parents:
    previous versions of a changeset, through a direct obsolete marker.

:obsolete-children:
    new versions of a changeset, through a direct obsolete marker.

:obsolete-ancestors:
    previous versions of a changeset, through any number of obsolete marker

:obsolete-descendant:
    new versions of a changeset, through any number of obsolete marker

:obsolete-diff:
    diff between a changeset and it's obsolete parent

:obsolete-tip:
    obsolete-descendants not obsolete themself.

:conflicting changeset:
    multiple obsolete-tip for an obsolete changeset through diverging obsolete
    marker (no changeset split marker)