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Systematic Parameterized Description of Pro-forms in the Prague Dependency Treebank 2.0

Systematic Parameterized Description of Pro-forms in the Prague Dependency Treebank 2.0. Magda Ševčíková Zdeněk Žabokrtský Institute of Formal and Applied Linguistics Charles University Prague, Czech Republic {sevcikova,zabokrtsky}@ufal.mff.cuni.cz. Outline of the talk. Introduction

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Systematic Parameterized Description of Pro-forms in the Prague Dependency Treebank 2.0

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  1. Systematic Parameterized Description of Pro-forms in the Prague Dependency Treebank 2.0 Magda Ševčíková Zdeněk Žabokrtský Institute of Formal and Applied Linguistics Charles University Prague, Czech Republic {sevcikova,zabokrtsky}@ufal.mff.cuni.cz

  2. Outline of the talk • Introduction • Description of pro-forms in the PDT 2.0 • Type 1 • Personal pronouns • Type 2 • Indefinite, negative, interrogative, and relative pronouns • Pro-adverbs and pro-numerals • Pro-forms in other languages • Final remarks sevcikova@ufal.mff.cuni.cz

  3. Introduction • Pro-forms • pronouns, pro-adverbs, and pro-numerals • closedclasses • to replace or substitute other words, phrases, or sentences • anaphoric and deictic functions • semantically relevant regularities within the sub-classes • nobody-never-nowhere • everybody-always-everywhere • Pro-forms in the PDT 2.0 • formal linguistic system for annotation of pro-forms making the present regularities explicit • part of the deep-syntactic layer (tectogrammatical layer, t-layer) • representation by a reduced set of (underlying) lemmas in combination with relevant attributes sevcikova@ufal.mff.cuni.cz

  4. PDT project Historical background • mid 1960’s Functional Generative Description (Petr Sgall et al.) • 1994 Czech National Corpus • 1995 PDT started • 1998 PDT 0.5 pre-release • 2001 PDT 1.0 released by LDC (LDC2001T10) • manual annotation of morphology and surface syntax • 2006 PDT 2.0 released by LDC(LDC2006T01) • interlinked morphological, surface-syntactic and complex deep-syntactic annotation sevcikova@ufal.mff.cuni.cz

  5. PDT 2.0 Layers of annotation • Tectogrammatical layer • deep-syntactic dependency tree • 59 % of the a-layer data • 3,165  doc., 49,431  sent., 833,195  tokens • Analytical layer • surface-syntactic dependency tree • 75 % of the m-layer data • 5,330 doc., 87,913 sent., 1,503,739 tokens • Morphological layer • m-lemma and m-tag associated with each token • 7,110 textual documents • 115,844 sent., 1,957,247 tokens • Word layer • original text, segmented on word boundaries Lit: [He] was would went to forest. [He] would have gone to the forest. sevcikova@ufal.mff.cuni.cz

  6. Outline of the talk • Introduction • Description of pro-forms in the PDT 2.0 • Type 1 • Personal pronouns • Type 2 • Indefinite, negative, interrogative, and relative pronouns • Pro-adverbs and pro-numerals • Pro-forms in other languages • Final remarks sevcikova@ufal.mff.cuni.cz

  7. Description of pro-forms in the PDT 2.0 • M-layer • pronouns, pro-adverbs, and pro-numerals treated separately • m-lemma, m-tag • T-layer • 2 basic types of description • type 1: personal pronouns • type 2: indefinite, negative, interrogative, and relative pronouns together with pro-adverbs and pro-numerals • semantic features originally present in the word form extracted and stored as values of inner attributes of the t-node that corresponds to the given word form sevcikova@ufal.mff.cuni.cz

  8. sevcikova@ufal.mff.cuni.cz

  9. Type 1Personal pronouns in the PDT 2.0 • all personal pronouns (no matter whether they are pro-dropped or present in the sentence) represented by nodes labeled with a single, artificial lemma #PersPron • grammatical information expressed by a personal pronoun in the sentence is stored in node attributes person, number, and gender • attribute politeness for discerning between honorific and non-honorific usage • vy jste přišel (you came said politely to a single person) • #PersPron + 2nd person + singular + masc.anim. + polite sevcikova@ufal.mff.cuni.cz

  10. Type 1Personal pronouns and co-reference at the t-layer, representation of personal pronouns was completed with the annotation of co-reference (i.e relations between nodes referring to the same entity) Tím, že Evropská unienechala ve rwandské operaci Francii na holičkách, podle Léotarda ukázala, že její politika nemá žádný africký rozměr. According to Léotard, by the fact that the European Union left France in the lurch concerning the Rwanda operation, [it] has shown that its politics has no African dimension. sevcikova@ufal.mff.cuni.cz

  11. Type 2Indefinite, negative, interrogative, and relative pronouns in the PDT 2.0 • in Czech, single meanings are expressed regularly by means of a relatively small group of prefixes that join together with a small set of bases • transparent correspondence between the semantic features and formal composition of pronouns: • indefinite prefix ně-: někdo(somebody) –něco(something) –nějaký (some) • negative prefix ni-: nikdo(nobody) –nic(nothing)… • at the t-layer, pronouns with the same base element grouped together, each pronoun group represented by the lemma corresponding to the respective relative pronoun: • e.g.někdo (somebody) and nikdo (nobody) represented by the lemma kdo(who) • corresponding possessive pronouns represented in the same way as the non-possessive ones • the semantic feature completing the reduced lemma was stored in the indeftype attribute sevcikova@ufal.mff.cuni.cz

  12. Type 2Indefinite, negative, interrogative, and relative pronouns and the indeftype attribute • all indefinite, negative, interrogative, and relative pronouns represented by only four lemmas at the t-layer • the reduced lemmas were completed by a value of the indeftype attribute • 11 values: sevcikova@ufal.mff.cuni.cz

  13. Type 2Pro-adverbs and pro-numerals in the PDT 2.0 • in Czech, pro-adverbs (e.g. nikde (nowhere), nějak(somehow)) and pro-numerals (e.g. několik (a few)) share certain semantic features with pronouns • represented in the same way as indefinite, negative, interrogative, and relative pronouns at the t-layer • another derivational relation can be seen between pro-adverbs with directional meaning and those of location – for example, the adverb odněkud(from somewhere) is represented as follows: • lemma kde (where) + indef1 value (of the indeftype attribute) + functor DIR1 capturing the directional meaning sevcikova@ufal.mff.cuni.cz

  14. Zakládá-li si někdo na tom, že se vyhýbá cizím slovům, pak udělá nejlíp, když se nikdy nepodívá do Etymologického slovníku jazyka českého. If someone finds it important that [he] eliminates foreign words, then the best thing [he] can do is if [he] never looks in the Etymology Dictionary of Czech. sevcikova@ufal.mff.cuni.cz

  15. Outline of the talk • Introduction • Description of pro-forms in the PDT 2.0 • Type 1 • Personal pronouns • Type 2 • Indefinite, negative, interrogative, and relativepronouns • Pro-adverbs and pro-numerals • Pro-forms in other languages • Final remarks sevcikova@ufal.mff.cuni.cz

  16. Pro-forms in other languagesPDT-like description • indefinite, negative, interrogative, and relative pronouns and other pro-forms are unproductive classes with (at least to a certain extent) transparent derivational relations also in other languages • preliminary sketch of several English and German pronouns: • still not solved: English anybody, German niemand and nirgendjemand … sevcikova@ufal.mff.cuni.cz

  17. Pro-forms in other languagesHelbig’s MultiNet Negative pro-adverbs • with local meaning • with directional meaning Lit.: The teacher finds nowhere a mistake. Der Lehrer findet nirgends einen Fehler. Lit.: Peter goes on holiday nowhere. Peter fährt in den Ferien nirgendwo hin. InHelbig, H. (2001), Die semantische Struktur natürlicher Sprache, Springer, 2001, p. 174 sevcikova@ufal.mff.cuni.cz

  18. Outline of the talk • Introduction • Description of pro-forms in the PDT 2.0 • Type 1 • Personal pronouns • Type 2 • Indefinite, negative, interrogative, and relativepronouns • Pro-adverbs and pro-numerals • Pro-forms in other languages • Final remarks sevcikova@ufal.mff.cuni.cz

  19. Final remarks • achievements: • all pro-forms in Czech divided into two groups: • personal (and corresponding possessive) pronouns • indefinite, negative, interrogative, and relative pronouns (and corresponding possessive pronouns) and pro-adverbs and pro-numerals • several pro-form analogies crossing the part-of-speech boundaries are explicitly marked in the annotation • verification of the formal system on large-scale data • future work: • to elaborate the system for other languages in more detail, taking into consideration specific phenomena of the respective language • to describe the relations among pro-form systems in more languages (for example, for the purposes of machine translation) sevcikova@ufal.mff.cuni.cz

  20. http://ufal.mff.cuni.cz/pdt2.0/ sevcikova@ufal.mff.cuni.cz

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