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Joint Apposition Extraction with Syntactic and Semantic Constraints

Will Radford and James R. Curran

The 51st Annual Meeting of the Association for Computational Linguistics - Short Papers (ACL Short Papers 2013)
Sofia, Bulgaria, August 4-9, 2013


Appositions are adjacent NPs used to add information to a discourse. We propose systems exploiting syntactic and semantic constraints to extract appositions from OntoNotes. Our joint log-linear model outperforms the state-of-the-art Favre and Hakkani-Tur (2009) model by ∼10% on Broadcast News, and achieves 54.3% F-score on multiple genres.

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