Both views converge to some extent in that the same underlying inventory of discourse relations is assumed.
[3] In a series of seminal papers, Jerry Hobbs [4][5] investigated the interplay of discourse relations and coherence since the late 1970s.
RST has been designed as a framework for the principled annotation discourse, driven by theoretical considerations, but with an applied perspective.
There is some variation among RST relations in different applications and annotated corpora, but the core inventory formulated by Mann and Thompson (1987) is generally considered as the basis.
Unlike RST and SDRT, PDTB does not postulate any structural constraints on discourse relations, but only defines a limit for the search space for a possible external argument.