The Penn Discourse Treebank (PDTB) is one of the most well-known examples (Miltsakaki et al., 2004;Prasad et al., 2008).
although multimodal corpora increasingly include discourse relations between linguistic and nonlinguistic contributions, particularly for utterances and other events in dialogue (Cuayáhuitl et al., 2015;Hunter et al., 2015), to date there has existed no dataset describing the coherence of text-image presentations.