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Discourse-level Annotation for Investigating Information Structure

Paper · 2004 · Ivana Kruijff-Korbayova and Geert-Jan M. Kruijff

Summary

The paper tackles a practical obstacle to studying information structure (IS): the field has many competing, loosely defined dichotomies such as Topic-Focus, Theme-Rheme and Given-New, so existing annotations are hard to compare or reuse. Within the MULI (MUltilingual Information structure) pilot project, the authors avoid labelling any theory-specific IS category. Instead, they enrich German and English financial-news extracts from the Tiger treebank and the Penn treebank with descriptive, theory-neutral features on three levels:

  • Syntax: marked constructions and voice.
  • Prosody: ToBI/GToBI labels on read-aloud recordings.
  • Discourse: properties of discourse referents, plus coreference and bridging links.

The paper concentrates on the discourse scheme. It covers semantic type and sort, denotation characteristics, quantification and familiarity of entities evoked mainly by nominal-like expressions. The authors also describe how stand-off layers produced by different tools are aligned. The main contribution is the scheme and resource design rather than an experimental result. Because the annotation stays descriptive, researchers can test the predictions of competing IS theories against the same data and combine it with other neutral resources.

Key points

  • Corpus size: The MULI corpus has 250 German sentences (about 3,500 tokens) drawn from 21 consecutive Tiger treebank texts. It also has 320 English sentences (about 7,000 tokens) from 10 Penn treebank texts, all in the financial news genre.
  • Syntax and prosody layers:
    • The syntax layer marks clefts, pseudo-clefts, reversed pseudo-clefts, extraposition, fronting, expletives and voice (active, mediopassive, passive).
    • The prosody layer was recorded with one native speaker per language and annotated in EMU using ToBI and GToBI conventions.
    • All German texts were annotated prosodically, but only some English examples.
  • Discourse referents:
    • Referents are typed as object, property, eventuality or textual entity.
    • Objects get finer sorts, such as person, organization, location, quantity and date/time.
    • Denotational uses (unique, specific, or unspecific/generic) are separated from non-denotational, attributive uses such as predicative NPs.
  • Anaphoric links: Coreference and bridging links build on MUC-7, DRAMA and related classifications. The relation type is stored on the anaphor's markable.
  • Tools and formats:
    • Prosody is annotated in EMU, syntax in XML-Spy with a DTD, and discourse in MMAX.
    • Every layer is a separate stand-off XML file pointing to a shared base token file, with the word as the common unit.
    • Punctuation and pauses are stored as attributes of the preceding word.
    • Some cases remain unresolved: compounds carrying several accents, and spoken number forms that differ from the written ones.

Interesting ideas

  • I1. Annotate observable cues rather than theoretical labels, and compute any theory's categories later from those cues; this keeps the data reusable when theories change.
  • I2. Distinguish expressions that pick out instances from expressions that merely attribute a property, and treat generic readings as reference to types.
  • I3. Keep each annotation level in its own stand-off file keyed to a shared token base, even when the levels could be merged into one hierarchy.
  • I4. When aligning modalities whose units differ, attach elements that one side lacks to the neighbouring word as attributes. Examples are punctuation, which is absent in speech, and pauses, which are absent in writing.
  • I5. Record the type of an anaphoric relation, identity or bridging, on the anaphor itself, so each mention carries its own explanation of how it connects back.

For Mova

How these ideas could serve Mova, our small open language model — its files, stages and tests:

  • I1 (frames): Store raw cues on frame slots, such as definiteness, voice, marked word order and familiarity. Givenness or topic can then be derived by an explicit rule layer that can be inspected and swapped.
  • I2 (world): A predicative NP should add a property to an existing entity rather than create a new one. Generic NPs should link to ontology types instead of individual entities.
  • I3 (learn): Silver outputs from each witness parser and teacher tier can be kept as separate layers over the same token IDs. Disagreements can then be compared and traced without destructive merging.
  • I4 (back): In the text → graph → text compressor, punctuation and spacing could be stored as attributes of the preceding token. Regenerated text could then be compared word-aligned with the original.
  • I5 (frames): The coreference step can tag each mention with its link kind. The world builder can then attach bridged entities, such as parts or roles of an earlier entity, instead of merging them.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Institutions

 Fields, topics and concepts

Cite

Cite as Ivana Kruijff-Korbayova and Geert-Jan M. Kruijff. 2004. Discourse-level Annotation for Investigating Information Structure. Proceedings of the Workshop on Discourse Annotation.

The paper itself, not this page. BibTeX from the library's record of the work.

@inproceedings{kruijffkorbayova2004discourse,
  title = {{Discourse-level Annotation for Investigating Information Structure}},
  author = {Ivana Kruijff-Korbayova and Geert-Jan M. Kruijff},
  booktitle = {Proceedings of the Workshop on Discourse Annotation},
  year = {2004},
  doi = {10.3115/1608938.1608944},
  url = {https://doi.org/10.3115/1608938.1608944}
}

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