There are no implemented interfaces.
There are no attributes in this class.
checkData(th, tpos, dh, pos)
checkTxn(th, pos)
copy(oid, serial, data, version, prev_txn, txnpos, datapos)
fail(pos, msg, *args)
getTxnFromData(oid, back)
Return transaction id for data at back.
setTxnPos(pos)
There are no known subclasses.