One is the Penn Discourse TreeBank (PDTB) (Webber and Joshi, 1998), built directly on top of Penn TreeBank (Marcus et al., 1993), composed of extracts from the Wall Street Journal.
a final set of 16 discourse functions described in metaTED was achieved, and it is composed as follows: • ADD -collapsed from Adding to Topic and Marking Asides  The annotation of metaTED was done through crowdsourcing, on Amazon Mechanical Turk (AMT) 3 .