RST posits an "Evidence" relation between the two spans. A paradigm case is a claim followed by evidence for the claim. The most frequent structural pattern is that two spans of text (virtually always adjacent, but exceptions can be found) are related such that one of them has a specific role relative to the other. A second level of structures, called schemas, is not presented here. These "blocks" are at two levels, the principal one dealing with "nuclearity" and "relations" (often called coherence relations in the linguistic literature). It posits a range of possibilities of structure - various sorts of "building blocks" which can be observed to occur in texts. RST is intended to describe texts, rather than the processes of creating or reading and understanding them. RST focuses on theįirst part - an evident role for every part. There is no sense that some parts are somehow missing. Some plausible reason for its presence, evident to readers, and furthermore, That is, for every part of a coherent text, there is some function, One formulation of coherence is that it is the absence of non-sequitursĪnd gaps. RST offers an explanation of the coherence of texts. Of sentences or other language generally lack. In ordinary usage, a text has a kind of unity that arbitrary collections In linguistics that is independent of its computational uses. Responding to this lack, RST was developed out of studies of edited orĬarefully prepared text from a wide variety of sources. Structure or function that provided enough detail to guide programming Matthiessen) noted that there was no available theory of discourse InĪbout 1983, part of the team (Bill Mann, Sandy Thompson and Christian Of Southern California) was working on computer-based authoring. A team at Information Sciences Institute (part of University RST was originally developed as part of studies of computer-based text
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