Another parallel may exist between work on nuclearity in RST and its use in summarization (Marcu, 1999).
our notion of a CENTRAL PROPOSITION is different than nuclearity in RST, since FACETS are derived from CEN-TRAL PROPOSITIONS that rise to the top of the pyramid across summarizers, and then (via AFS) across many dialogs on a topic, while RST nuclearity is only defined for a span of text by a single speaker.