For example: "Allied Capital is a closed-end management investment company that will operate as a business development concern." As shown in Figure 1 , illustration relations can be sub-divided into sub-categories: joint, list, disjoint, and elaboration relations according to the RST Discourse Treebank (Carlson and Marcu, 2001 ) and the Penn Discourse TreeBank <cite>(Prasad et al., 2008)</cite> .