Grammatik
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Manual development of deep linguistic resources is time-consuming and costly and therefore often described as a bottleneck for traditional rule-based NLP. In my PhD thesis I present a treebank-based method for the automatic acquisition of LFG resources for German. The method automatically creates deep and rich linguistic presentations from labelled data (treebanks) and can be applied to large data sets. My research is based on and substantially extends previous work on automatically acquiring wide-coverage, deep, constraint-based grammatical resources from the English Penn-II treebank (Cahill et al.,2002; Burke et al., 2004; Cahill, 2004). Best results for English show a dependency f-score of 82.73% (Cahill et al., 2008) against the PARC 700 dependency bank, outperforming the best hand-crafted grammar of Kaplan et al. (2004). Preliminary work has been carried out to test the approach on languages other than English, providing proof of concept for the applicability of the method (Cahill et al., 2003; Cahill, 2004; Cahill et al., 2005). While first results have been promising, a number of important research questions have been raised. The original approach presented first in Cahill et al. (2002) is strongly tailored to English and the datastructures provided by the Penn-II treebank (Marcus et al., 1993). English is configurational and rather poor in inflectional forms. German, by contrast, features semi-free word order and a much richer morphology. Furthermore, treebanks for German differ considerably from the Penn-II treebank as regards data structures and encoding schemes underlying the grammar acquisition task. In my thesis I examine the impact of language-specific properties of German as well as linguistically motivated treebank design decisions on PCFG parsing and LFG grammar acquisition. I present experiments investigating the influence of treebank design on PCFG parsing and show which type of representations are useful for the PCFG and LFG grammar acquisition tasks. Furthermore, I present a novel approach to cross-treebank comparison, measuring the effect of controlled error insertion on treebank trees and parser output from different treebanks. I complement the cross-treebank comparison by providing a human evaluation using TePaCoC, a new testsuite for testing parser performance on complex grammatical constructions. Manual evaluation on TePaCoC data provides new insights on the impact of flat vs. hierarchical annotation schemes on data-driven parsing. I present treebank-based LFG acquisition methodologies for two German treebanks. An extensive evaluation along different dimensions complements the investigation and provides valuable insights for the future development of treebanks.
Die vorliegende Dissertation reiht sich in die Diskussion um die Verwendungsweise der deutschen Konstruktion werden + Infinitiv ein und stellt dem so genannten Temporalisten/Modalisten-Dissens eine dritte Position abseits einer kategorialgrammatischen Klassifizierung bei. Untersucht wird die Ausprägung des epistemisch modalen und des temporalen Bedeutungselementes der Periphrase werden + Infinitiv und die Abhängigkeit dieser Ausprägung von bestimmenden Faktoren im Vergleich mit Präsens, Perfekt und Präsens pro Futuro. Zur Anwendung kommen hierbei vornehmlich webbasierte Experimentalparadigmen, welche nicht nur die Untersuchungen der Arbeit auf eine breite empirische Basis stellen, sondern auch eine systematische und kontrollierte Analyse ermöglichen. Überdies enthält die vorliegende Arbeit einen methodischen Teil, der auf etwaige Unterschiede zwischen webbasierten und laborgestützen Experimenten eingeht.
The principal claim of this dissertation is that there is a unique structural core shared by Double Object, Dative Experiencer and Existential/Presentational constructions. This core is argued to take the form of a Cipient Predication structure, `cipient covering traditional notions like (affected) source/goal, recipient, indirect object or dative experiencer. Central questions arising in defining Cipient Predication are: How are cipients thematically licensed, and what is the role of there in argument-structural terms? What is the structural locus of cipients/there? What is the role and nature of dative case? How can the possessive interpretation, the blocking and definiteness effects associated with the above-mentioned constructions be explained? Cipients are presented as external arguments and logical subjects (location individuals) of predicates derived from a propositional meaning embedded in the VP, the predicate formed by a lower tense head `little t that is overtly realized as there. Little t is argued to encode a distinction at the reference time level, structural dative hinging on a tense property like structural nominative. The cipient relates as a whole to a part to a VP-internal location argument that together with the theme furnishes the propositional meaning (`possession ). As logical subjects, cipients anchor the predicate to the utterance context, forcing its interpretation in extralinguistic terms (`blocking effects ). It is proposed that lacking structurally encoded subjects, Existential/Presentational constructions are not saturated expressions in syntax, precluding the interpretation of certain quantifiers (most/every, vide `definiteness effects ). Cipient Predication, couched in terms of the Minimalist Program (in particular, Chomsky 1999) and a semantics relying on tense and the ontological distinction of locations as well as scalar and part-whole structure, should be of interest to scholars working on datives, argument structure, and the syntax/semantics/pragmatics interface more generally.