This has resulted in the creation of discourse-annotated corpora, such as the Penn Discourse Treebank (PDTB) (Prasad et al., 2008), the Rhetorical Structure Theory (RST) Treebank (Carlson et al., 2002), and the Annodis corpus (Segmented Discourse Representation Theory, SDRT) (Afantenos et al., 2012), to name a few.
as of yet, the different frameworks are not inter-operable, nor is there a unified scheme for discourse annotation (but see the proposals by Benamara and Taboada (2015), Chiarcos (2014), Bunt et al.