Paper: Can Text Structure Be Incompatible With Rhetorical Structure?

ACL ID W00-1426
Title Can Text Structure Be Incompatible With Rhetorical Structure?
Venue International Conference on Natural Language Generation
Session Main Conference
Year 2000
Authors

Scott and Souza (1990) have posed the problem of how a rhetorical structure (in which proposi- tions are linked by rhetorical relations, but not yet arranged in a linear order) can be realized by a text structure (in which propositions are ordered and linked up by appropriate discourse connectives). Almost all work on this problem assumes, implicitly or explicitly, that this map- ping is governed by a constraint on compatibil- ity of structure. We show how this constraint can be stated precisely, and present some coun- terexamples which seem acceptable even though they violate compatibility. The examples are based on a phenomenon we call extraposition, in which complex embedded constituents of a rhetorical structure are extracted and realized separately.