Frank Richter


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Pattern-Based Extraction of Negative Polarity Items from Dependency-Parsed Text
Fabienne Fritzinger | Frank Richter | Marion Weller
Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)

We describe a new method for extracting Negative Polarity Item candidates (NPI candidates) from dependency-parsed German text corpora. Semi-automatic extraction of NPIs is a challenging task since NPIs do not have uniform categorical or other syntactic properties that could be used for detecting them; they occur as single words or as multi-word expressions of almost any syntactic category. Their defining property is of a semantic nature, they may only occur in the scope of negation and related semantic operators. In contrast to an earlier approach to NPI extraction from corpora, we specifically target multi-word expressions. Besides applying statistical methods to measure the co-occurrence of our candidate expressions with negative contexts, we also apply linguistic criteria in an attempt to determine to which degree they are idiomatic. Our method is evaluated by comparing the set of NPIs we found with the most comprehensive electronic list of German NPIs, which currently contains 165 entries. Our method retrieved 142 NPIs, 114 of which are new.


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Constraint-Based Computational Semantics: A Comparison between LTAG and LRS
Laura Kallmeyer | Frank Richter
Proceedings of the Eighth International Workshop on Tree Adjoining Grammar and Related Formalisms


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A Web-based Instructional Platform for Contraint-Based Grammar Formalisms and Parsing
W. Detmar Meurers | Gerald Penn | Frank Richter
Proceedings of the ACL-02 Workshop on Effective Tools and Methodologies for Teaching Natural Language Processing and Computational Linguistics