ProtectedallEquation number as equation begins.
ProtectedcounterCurrent equation number.
ProtectedhistoryChronology of all previous tags, in case we need to look something up in the finalize method.
ProtectedsubcounterThe counter for the subnumber.
The environment that is currently tagged.
The label to use for the next tag.
The label to use for the next tag.
ProtectedformatHow to format ids for labelling equations.
The unique part of the id (e.g., label or number).
The formatted id.
A tagging class for the subnumcases environment.