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Exploring Discourse Representation Theory: Construction Strategies and DRS Threading Techniques

This chapter delves into Discourse Representation Theory (DRT) emphasizing its flexibility and compatibility with various construction strategies. Key topics include DRS threading, underspecified DRSs, and the significance of syntactic constituents. The chapter reviews hole semantics, lexical entries, and the merging operations in DRS language while addressing coordination caveats. Through examples like "Every boxer loves a woman," it illustrates how dominance constraints influence DRS completion and plugging operations, providing insights into sentence semantics and underspecified interpretations.

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Exploring Discourse Representation Theory: Construction Strategies and DRS Threading Techniques

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  1. Chapter 2: Building Discourse Representations November 14, 2007 Matt Gerber

  2. DRS Construction • Claim: DRT is a flexible theory compatible with a range of construction strategies • DRS threading • Rehash of the SCA • -DRSs • -abstraction approach • Underspecified DRSs • Hole semantics

  3. DRS threading • A different perspective on the standard construction algorithm • Syntactic constituents are “threaded” through the current DRS

  4. DRS threading • Simple IV “dances”: • Key: input/output DRS, the difference between the two being the semantic contribution of the current node

  5. DRS threading • “Mia dances”: • Unary branching rules add no semantic content

  6. DRS threading • “Every gimp runs”: antecedent formation

  7. DRS threading • “Every gimp runs”: DRS completion

  8. -DRSs • Parallel approach to sentence semantics for DRT • Create DRSs through functional application

  9. -DRSs • Addition to DRS language: the merge operation • Union of discourse referents and conditions

  10. -DRSs • Coordination caveat: “A woman walks and a woman talks.” *

  11. -DRSs • Some lexical entries (nouns):

  12. -DRSs • Some lexical entries (determiners): Previously:

  13. -DRSs • Some lexical entries (verbs):

  14. “Every woman dances”:

  15. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman”

  16. Underspecified DRSs • Review: hole semantics • Valid plugging: any that produces a formula tree and respects the dominance constraints

  17. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman” (weaker) Universal quantifier out-scopes existential quantifier

  18. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman” (stronger) Existential quantifier out-scopes universal quantifier

  19. Underspecified DRSs • Example: “Every boxer loves a woman” • Available DRS “chunks”:

  20. Underspecified DRSs • Example: “Every boxer loves a woman” • Dominance constraints • : ensures the verb is out-scoped by the two NP DRSs

  21. Underspecified DRSs • Example: “Every boxer loves a woman” Possible pluggings:

  22. Underspecified DRSs • Example: “Every boxer loves a woman” Possible pluggings: Plugging P1 Plugging P2

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