A Compositional Semantics of Temporal Expressions in English
What it is about
The paper gives the temporal semantics of the meaning representation of JANUS, a naval query system. Tense is given narrow scope over the main verb, and times are quantified explicitly. Following Reichenbach, each evaluation has a speech time, an event time and a reference time, so that "Vincent left yesterday" puts the event in the day before the reference time. Quantified noun phrases such as "every admiral" receive a contextually salient restrictor, and a discourse entity built from an earlier sentence can serve as the referent of a later plural pronoun, following Webber. The paper shows that a single-index tense logic gets wrong the readings of sentences with tense and time adverbials, negation, quantified subjects and sequences of events. There are no numerical results; the argument is by worked formulas.
Ideas
- I1. Multi-index time in the world: store event time and reference time as separate fields in
world/src/events.rs, so that "yesterday" moves the reference time and not the event. Measure on the temporal questions in the school lessons, run twice. - I2. A restrictor for quantifiers: attach to each quantified noun phrase the set of entities of the current lesson, and test
world/src/qa.rswith and without it. This is a deterministic version of the paper's contextual R. - I3. A discourse-entity table for plural pronouns: after each sentence, record the plural set its nouns describe, and resolve "they" against that table, as Webber's rule does. Test on the coreference data.
- I4. A negative control: sentences like "every X was once Y" where a simultaneous reading would be wrong. The answer must differ from that reading.
For Mova
Chapters: 13. Verbs (tense), 36. Discourse relations and coherence, 35. Reference and coreference. Code: world/src/events.rs, world/src/qa.rs, coref/src/sieve.rs. Measure: accuracy on temporal and pronoun questions with and without the new fields, run twice.
Cite
@inproceedings{hinrichs1987compositional,
title = {{A Compositional Semantics of Temporal Expressions in English}},
author = {Hinrichs, Erhard W.},
booktitle = {25th Annual Meeting of the Association for Computational Linguistics},
year = {1987},
doi = {10.3115/981175.981177},
url = {https://doi.org/10.3115/981175.981177}
}References
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