Anaphora and Discourse Structure
What it is about
The paper argues that discourse adverbials such as "then", "otherwise", "instead", "also" and "for example" are anaphors. They link their clause to an entity in the discourse context, and they do not signal a structural relation between adjacent units. The argument rests on a test. Structural connectives (subordinating conjunctions and paired connectives such as "on the one hand ... on the other hand") may stretch a dependency over embedded material, but they never let it cross another dependency. Adverbials do cross. In "because then he discovered he was broke", "then" takes its first argument across the "because" link; in "if instead you plan to go to the zoo", "instead" does the same. Discourse structure therefore stays a simple tree or DAG without crossings, and the adverbial's first argument is found by anaphora, as pronouns and definite NPs are. The paper sketches a lexicalised tree-adjoining grammar for discourse, with initial trees for subordinate conjunctions and adverbials. It reports no numbers; the evidence is in constructed examples.
Ideas
- I1. Put the crossing test into the discourse rules: a connective whose first argument is not the previous unit gets an anaphoric label. Count the cases in Mova's lesson texts and check each by hand.
- I2. For "then", "otherwise" and "instead", the candidate first arguments are earlier events. Store recent events in
world/src/narr.rs, and select by a rule (for example, the most recent event with a matching aspect class). Measure accuracy on hand-checked examples. - I3. Add the paper's presupposition types to 19. The lexicon: vocabulary, multiword expressions and register, with one search rule per type.
- I4. Negative control: sentences with an adverbial and no earlier candidate must not get an antecedent. A shuffled-sentence version of each passage must lower accuracy.
For Mova
The chapters are 36. Discourse relations and coherence, 35. Reference and coreference (anaphora) and 38. Dialogue, discourse markers and reported speech. The code is world/src/qud.rs, world/src/narr.rs and prag/src/frames.rs. The measure is the accuracy of adverbial antecedents on a hand-checked set, run twice, with the shuffled control.
Cite
@article{webber2003anaphora,
title = {{Anaphora and Discourse Structure}},
author = {Webber, Bonnie and Stone, Matthew and Joshi, Aravind and Knott, Alistair},
journal = {Computational Linguistics},
year = {2003},
doi = {10.1162/089120103322753347},
url = {https://doi.org/10.1162/089120103322753347}
}References
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