Before revision:  In this paper , we consider the problem with additionalfairness constraints , which takes into account the group membership of data items and limits the  number of items selected from each group to a given number.
After revision:  In this paper , we consider the problem with additionalfairness constraints setting where data items in the stream belong to one of several disjoint groups and investigate the optimization problem with an additional number of items selected from each group to a given number.