To serve users better, it could be more helpful to further highlight novel information at the sentence level.
later studies focused on detecting novel sentences, such as those reported in TREC 2002-2004Novelty Tracks (Harman, 2002Soboroff and Harman, 2003;Soboroff, 2004), which compared various novelty metrics (Allan et al., 2003), and integrated different natural language techniques (Ng et al., 2007;Li and Croft, 2008).