Both Nissim (2006) and Rahman and Ng (2011) classify each mention individually in a standard supervised ML setting, not considering potential dependencies between the IS categories of different mentions.
collective or joint classification has made substantial impact in other NLP tasks, such as opinion mining (Pang and Lee, 2004;Somasundaran et al., 2009), text categorization (Yang et al., 2002;Taskar et al., 2002) and the related task of coreference resolution (Denis and Baldridge, 2007).