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The ACL 2008 Workshop on Parsing German features a shared task on parsing German. The goal of the shared task was to find reasons for the radically different behavior of parsers on the different treebanks and between constituent and dependency representations. In this paper, we describe the task and the data sets. In addition, we provide an overview of the test results and a first analysis.
This paper proposes a corpus encoding standard that meets the needs of linguistic research using a variety of linguistic data structures. The standard was developed in SFB 441, a research project at the University of Tuebingen. The principal concern of SFB 441 are the empirical data structures which feed into linguistic theory building. SFB 441 consists of several projects, most of which are building corpora to empirically investigate various linguistic phenomena in various languages (e.g. modal verbs in German, forms of address and politeness in Russian). These corpora will form the components of the "Tuebingen collection of reusable, empirical, linguistic data structures (TUSNELDA)". The TUSNELDA annotation standard aims at providing a uniform encoding scheme for all subcorpora and texts of TUSNELDA such that they can be processed with uniform standardized tools. To guarantee maximal reusability we use XML for encoding. Previous SGML standards for text encoding were provided by the Text Encoding Initiative (TEI) and the Expert Advisory Group on Language Engineering Standards (Corpus Encoding Standard, CES). The TUSNELDA standard is based on TEI and XCES (XML version of CES) but takes into account the specific needs of the SFB projects, i.e. the peculiarities of the examined languages and linguistic phenomena.
The purpose of this paper is to describe the TüBa-D/Z treebank of written German and to compare it to the independently developed TIGER treebank (Brants et al., 2002). Both treebanks, TIGER and TüBa-D/Z, use an annotation framework that is based on phrase structure grammar and that is enhanced by a level of predicate-argument structure. The comparison between the annotation schemes of the two treebanks focuses on the different treatments of free word order and discontinuous constituents in German as well as on differences in phrase-internal annotation.
Quantitative evaluation of parsers has traditionally centered around the PARSEVAL measures of crossing brackets, (labeled) precision, and (labeled) recall. However, it is well known that these measures do not give an accurate picture of the quality of the parsers output. Furthermore, we will show that they are especially unsuited for partial parsers. In recent years, research has concentrated on dependencybased evaluation measures. We will show in this paper that such a dependency-based evaluation scheme is particularly suitable for partial parsers. TüBa-D, the treebank used here for evaluation, contains all the necessary dependency information so that the conversion of trees into a dependency structure does not have to rely on heuristics. Therefore, the dependency representations are not only reliable, they are also linguistically motivated and can be used for linguistic purposes.
This paper presents an approach to the question whether it is possible to construct a parser based on ideas from case-based reasoning. Such a parser would employ a partial analysis of the input sentence to select a (nearly) complete syntax tree and then adapt this tree to the input sentence. The experiments performed on German data from the Tüba-D/Z treebank and the KaRoPars partial parser show that a wide range of levels of generality can be reached, depending on which types of information are used to determine the similarity between input sentence and training sentences. The results are such that it is possible to construct a case-based parser. The optimal setting out of those presented here need to be determined empirically.
Die Ressource "Wissen" rückte in den letzten Jahrzehnten als Quelle wissenschaftlicher Innovation immer stärker ins Zentrum des Interesses. Diese Fokussierung mündete in eine Selbstreflexion der Wissenschaft und der wissenschaftlichen Disziplinen: Thematisiert werden vor allem die Art und Weise, wie Wissen gewonnen wird, sowie die damit zusammenhängende Frage nach der Konstruktion von Wissenschaftlichkeit, womit das Bewusstsein gleichzeitig auf die mehr und mehr sich auflösende Abgrenzung zwischen den Disziplinen beziehungsweise zwischen den drei hauptsächlichen Wissenschaftskulturen, von Natur-, Geistes- und Kultur- sowie Sozialwissenschaften gelenkt wird. Innerhalb und außerhalb der Universitäten bildeten und bilden sich nicht immer klar verortbare "trading zones" (Gallison 1997), in denen neue Formen und Techniken der Wissensproduktion und Wissensvermittlung geprüft, geübt und teilweise auch institutionalisiert werden. ...
Tree-local MCTAG with shared nodes : an analysis of word order variation in German and Korean
(2004)
Tree Adjoining Grammars (TAG) are known not to be powerful enough to deal with scrambling in free word order languages. The TAG-variants proposed so far in order to account for scrambling are not entirely satisfying. Therefore, an alternative extension of TAG is introduced based on the notion of node sharing. Considering data from German and Korean, it is shown that this TAG-extension can adequately analyse scrambling data, also in combination with extraposition and topicalization.
This paper profiles significant differences in syntactic distribution and differences in word class frequencies for two treebanks of spoken and written German: the TüBa-D/S, a treebank of transliterated spontaneous dialogs, and the TüBa-D/Z treebank of newspaper articles published in the German daily newspaper ´die tageszeitung´(taz). The approach can be used more generally as a means of distinguishing and classifying language corpora of different genres.
In this paper we present a parsing architecture that allows processing of different mildly context-sensitive formalisms, in particular Tree-Adjoining Grammar (TAG), Multi-Component Tree-Adjoining Grammar with Tree Tuples (TT-MCTAG) and simple Range Concatenation Grammar (RCG). Furthermore, for tree-based grammars, the parser computes not only syntactic analyses but also the corresponding semantic representations.
In this paper, we present an open-source parsing environment (Tübingen Linguistic Parsing Architecture, TuLiPA) which uses Range Concatenation Grammar (RCG) as a pivot formalism, thus opening the way to the parsing of several mildly context-sensitive formalisms. This environment currently supports tree-based grammars (namely Tree-Adjoining Grammars (TAG) and Multi-Component Tree-Adjoining Grammars with Tree Tuples (TT-MCTAG)) and allows computation not only of syntactic structures, but also of the corresponding semantic representations. It is used for the development of a tree-based grammar for German.
Chunk parsing has focused on the recognition of partial constituent structures at the level of individual chunks. Little attention has been paid to the question of how such partial analyses can be combined into larger structures for complete utterances. The TüSBL parser extends current chunk parsing techniques by a tree-construction component that extends partial chunk parses to complete tree structures including recursive phrase structure as well as function-argument structure. TüSBLs tree construction algorithm relies on techniques from memory-based learning that allow similarity-based classification of a given input structure relative to a pre-stored set of tree instances from a fully annotated treebank. A quantitative evaluation of TüSBL has been conducted using a semi-automatically constructed treebank of German that consists of appr. 67,000 fully annotated sentences. The basic PARSEVAL measures were used although they were developed for parsers that have as their main goal a complete analysis that spans the entire input.This runs counter to the basic philosophy underlying TüSBL, which has as its main goal robustness of partially analyzed structures.
Nous présentons ici différents algorithmes d’analyse pour grammaires à concaténation d’intervalles (Range Concatenation Grammar, RCG), dont un nouvel algorithme de type Earley, dans le paradigme de l’analyse déductive. Notre travail est motivé par l’intérêt porté récemment à ce type de grammaire, et comble un manque dans la littérature existante.
We adopt Markert and Nissim (2005)’s approach of using the World Wide Web to resolve cases of coreferent bridging for German and discuss the strength and weaknesses of this approach. As the general approach of using surface patterns to get information on ontological relations between lexical items has only been tried on English, it is also interesting to see whether the approach works for German as well as it does for English and what differences between these languages need to be accounted for. We also present a novel approach for combining several patterns that yields an ensemble that outperforms the best-performing single patterns in terms of both precision and recall.
In this paper, we argue that difficulties in the definition of coreference itself contribute to lower inter-annotator agreement in certain cases. Data from a large referentially annotated corpus serves to corroborate this point, using a quantitative investigation to assess which effects or problems are likely to be the most prominent. Several examples where such problems occur are discussed in more detail, and we then propose a generalisation of Poesio, Reyle and Stevenson’s Justified Sloppiness Hypothesis to provide a unified model for these cases of disagreement and argue that a deeper understanding of the phenomena involved allows to tackle problematic cases in a more principled fashion than would be possible using only pre-theoretic intuitions.
Weak function word shift
(2004)
The fact that object shift only affects weak pronouns in mainland Scandinavian is seen as an instance of a more general observation that can be made in all Germanic languages: weak function words tend to avoid the edges of larger prosodic domains. This generalisation has been formulated within Optimality Theory in terms of alignment constraints on prosodic structure by Selkirk (1996) in explaining thedistribution of prosodically strong and weak forms of English functionwords, especially modal verbs, prepositions and pronouns. But a purely phonological account fails to integrate the syntactic licensing conditions for object shift in an appropriate way. The standard semantico-syntactic accounts of object shift, onthe other hand, fail to explain why it is only weak pronouns that undergo object shift. This paper develops an Optimality theoretic model of the syntax-phonology interface which is based on the interaction of syntactic and prosodic factors. The account can successfully be applied to further related phenomena in English and German.
Die Bedeutung des philosophischen Programms John McDowells, das schon in der theoretischen Philosophie eine revolutionäre Neuausrichtung vornimmt, kann erst voll erkannt werden, wenn man auch seine Konsequenzen für die praktische Philosophie in den Blick nimmt. Zwar geht Geist und Welt primär von Dilemmata der Erkenntnistheorie aus. Aus McDowells Vorschlag, die Gleichsetzung der äußeren Natur mit dem bedeutungsfreien Raum der Naturgesetze zugunsten einer Konzeption von Gründen in der Welt aufzugeben, ergibt sich aber die Möglichkeit einer so neuartigen Perspektive auf die Natur moralischer Urteile, dass es fast so scheint, als sei McDowells theoretisches Programm auf diesen Gewinn für die praktische Philosophie hin angelegt worden.
In recent years, research in parsing has extended in several new directions. One of these directions is concerned with parsing languages other than English. Treebanks have become available for many European languages, but also for Arabic, Chinese, or Japanese. However, it was shown that parsing results on these treebanks depend on the types of treebank annotations used. Another direction in parsing research is the development of dependency parsers. Dependency parsing profits from the non-hierarchical nature of dependency relations, thus lexical information can be included in the parsing process in a much more natural way. Especially machine learning based approaches are very successful (cf. e.g.). The results achieved by these dependency parsers are very competitive although comparisons are difficult because of the differences in annotation. For English, the Penn Treebank has been converted to dependencies. For this version, Nivre et al. report an accuracy rate of 86.3%, as compared to an F-score of 92.1 for Charniaks parser. The Penn Chinese Treebank is also available in a constituent and a dependency representations. The best results reported for parsing experiments with this treebank give an F-score of 81.8 for the constituent version and 79.8% accuracy for the dependency version. The general trend in comparisons between constituent and dependency parsers is that the dependency parser performs slightly worse than the constituent parser. The only exception occurs for German, where F-scores for constituent plus grammatical function parses range between 51.4 and 75.3, depending on the treebank, NEGRA or TüBa-D/Z. The dependency parser based on a converted version of Tüba-D/Z, in contrast, reached an accuracy of 83.4%, i.e. 12 percent points better than the best constituent analysis including grammatical functions.
Der Workshop "Nationale Spezifika und internationale Aspekte in der Wissenschaftsentwicklung – unter besonderer Berücksichtigung der Narratologie" soll, so die Organisatoren in ihrer Einladung – "Gelegenheit bieten, Bedingungen und Möglichkeiten integrativer Ansätze zur Untersuchung von Wissenschaftsprozessen zu diskutieren und wichtige Faktoren der Wissenschaftsentwicklung zu benennen und kritisch zu beleuchten." Die Produktion, Distribution und Rezeption von Wissenssystemen vollziehe sich, schreiben die Organisatoren, "in unterschiedlichen nationalen und internationalen sozialen Räumen, die sowohl die Form als auch den kognitiven Gehalt von Theorien mitunter stark mitstrukturieren, ihre Durchsetzung begünstigen oder behindern. Das wird besonders deutlich, wenn man Transferprozesse von Theorien verfolgt." Den Begriff des Wissenstransfers, der hier in Anschlag gebracht wird, möchte ich in meinem Beitrag einer terminologischen Klärung zuführen. Dazu möchte ich zunächst einige terminologische Überlegungen über den Status der Teilbegriffe anstellen, aus denen der Begriff zusammengesetzt ist (I.), dann die Verwendung des Begriffs in verschiedenen disziplinären Kontexten beobachten (II.) und schließlich einen Vorschlag für eine differenzierte Verwendung des Begriffs als Analysekategorie der Wissenschaftsentwicklung machen (III).
In this paper, we introduce an extension of the XMG system (eXtensibleMeta-Grammar) in order to allow for the description of Multi-Component Tree Adjoining Grammars. In particular, we introduce the XMG formalism and its implementation, and show how the latter makes it possible to extend the system relatively easily to different target formalisms, thus opening the way towards multi-formalism.
Die unten folgende Stellungnahme wurde dem Herausgeber der Zeitschrift für deutsches Altertum und deutsche Literatur angeboten, um eine Reihe von gravierenden Missverständnissen eines Rezensenten (Jürgen Schulz-Grobert) auszuräumen, die dieser in seiner Besprechung des zweiten Bandes der Sämtlichen Werke Johann Fischarts der Fachwelt gegenüber erkennen ließ. Der Herausgeber der Zeitschrift verweigerte sich einer Diskussion und lehnte den Abdruck unserer Entgegnung ab. Dies ist umso bedauerlicher, als uns der Rezensent den Vorwurf gemacht hat, unsere "Diskussionsbereitschaft [...] [sei] auch in anderen entscheidenden Fragen ausgesprochen begrenzt", was immer er damit meint.