TAILIEUCHUNG - Báo cáo khoa học: "INCREMENTAL DEPENDENCY PARSING"

The paper introduces a dependency-based grammar and the associated parser and focusses on the problem of determinism in parsing and recovery from errors. First, it is shown how dependency-based parsing can be afforded, by taking into account the suggestions coming from other approaches, and the preference criteria for parsing are briefly addressed. Second, the issues of the interconnection between the syntactic analysis and the semantic interpretation in incremental processing are discussed and the adoption of a TMS for the recovery of the processing errors is suggested. THE BASIC PARSING ALGORITHM The parser has been devised for a system that. | INCREMENTAL DEPENDENCY PARSING Vincenzo Lombardo Dipartimento di Informatica - Universita di Torino Svizzera 185 - 10149 Torino - Italy e-mail vincenzo@ Abstract The paper introduces a dependency-based grammar and the associated parser and focusses on the problem of determinism in parsing and recovery from errors. First it is shown how dependency-based parsing can be afforded by taking into account the suggestions coming from other approaches and the preference criteria for parsing are briefly addressed. Second the issues of the interconnection between the syntactic analysis and the semantic interpretation in incremental processing are discussed and the adoption of a TMS for the recovery of the processing errors is suggested. THE BASIC PARSING ALGORITHM The parser has been devised for a system that works on the Italian language. The structure that results from the parsing process is a dependency tree that exhibits syntactic and semantic information. The dependency structure The structure combines the traditional view of dependency syntax with the feature terms of the unification based formalisms Shieber 86 single attributes like number or tense appear inside the nodes of the tree while complex attributes like grammatical relations are realized as relations between nodes. The choice of a dependency structure which is very suitable for free word order languages Sgall et al. 86 reflects the intuitive idea of a language with few constraints on the order of legal constructions. Actually the flexibility of a partially configurational language like Italian that can be considered at an intermediate level between the totally configurational languages like English and the totally inflected free-ordered Slavonic languages can be accounted for with a relaxation of the strong constraints posed by a constituency grammar Stock 1989 or by constraining to a certain level a dependency grammar. Cases of topicalization like un dolce di frutta ha ordinato il maestro a .

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