Paper: Veins Theory: A Model of Global Discourse Cohesion and Coherence

ACL ID P98-1044
Title Veins Theory: A Model of Global Discourse Cohesion and Coherence
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 1998
Authors

In this paper, we propose a generalization of Centenng Theory (CT) (Grosz, Joshi, Weinstein (1995)) called Veins Theory (VT), which extends the applicability of centering rules from local to global discourse. A key` facet of the theory involves the idenufication of <> over discourse structure trees such as those defined in RST, which delimit domains of referential accessibility for each unit in a discourse. Once identified, reference chains can be extended across segment boundaries, thus enabling the application of CT over the entire discourse. We describe the processes by which veins are defined over discourse structure trees and how CT can be applied to global discourse by using these chains. We also define a discourse <> index which can be used to compare different di...