TGE: Tlinks Generation Environment

TGE: Tlinks Generation Environment. Alicia Ageno, Francesc Ribas ~ , German Rigau:, I loracio Rodrfguez, Anna S~nniotou. Dep~tament de l~leugnatgcs i Sistcmes hfform:'ttics. Universitat Politb~cnica de Cat~dunya. Pan (',argallo 5, 08028 Barcelona. Spain. horacio@Isi.upc.es Abstract This paper describes the enhancements made, within a unification framework, based on typed feature structures, in order to support linking of lexical entries to their translation equivalents. To help this task we have developed an interactive environment: TGE. Several experiments, corresponding to rather "closed" semantic domains, have been developed in order to generate lexical cross-relations between English and Spanish. Keywords Lexicons, electronic dictionaries, machine translation. 1 Introduction Recently, several approaches have been made to extend lexical unification-based formalisms to deal with multilinguistie phenomena in order to be used in applications such ,as Machine Translation [7]. Within Acquilex IP Project, a unification framework based on typed feature structures [4] was ddveloped, the LKB (Lexical Knowledge Base), in order to represent conceptual units corresponding to lexieal senses, lexical and phrasal rules, multilingual rclalionships, elc. This paper describes the enhancements made, to the LKB system [6], in order to support linking of lexical entries to their translation equivalents. The organisation of the paper is as follows: Section 2 presents the motivations and formalisation of tlinks (for "translation links"). Section 3 deals with TGE (Tlinks Generation Environment), the way we propose to help in constructing lexical linkages semi-automatically from LKB data and bilingual dictionaries [13], [8], loaded in the LDR (Lexical Data Base) environment [5]. Section 4 shows the use of'l'GE 1 This researcher has been snported by a grant o.f the Departament d'Ensenyament (~]'Generalitat de Catahmya. 91- DOCG-1491. 2 This researcher has been snported by o grant o/" the Ministerio tie Educacidn y Ciencia. 92.BOF. 16392. 3 AcquilexH EC Esprit project BRA 7315. within SEISD 4 [1] (Sistema de extracci6n de Informacidn Sem~ntica de Diccionarios). In section 5 some experimental results ,are presented. Finally in section 6 we present our conclusions ,and furtl~er lines of research. 2 Tlinks The initial assumption was that the basic units for defining lexical translation equivalence should be the lexical entries in the monolingual LKBs, which should, in general, correspond to word senses in the dictionary. Although in the simplest cases we c,'m consider the lexical entries themselves as translation equiv,-dent, in general more complex cases occur corresponding to lexical gaps, differences in morphologic or lexical features, specificity, etc. [11]. We will therefore represent the relationships between words in terms of tlinks. The tlink mechanism is general enough to allow the monolingual information to be augmented with translation specific information, in a variety of ways. We will first describe the tlink mechanism in the LKB and then outline how some of these more complex equivalences can be represented. The LKB formalism uses a typed feature structure (FS) system for representing lexical knowledge. So we can define tlinks in terms of relations between FSs. Lexical (or phrasal) transformatious in both source and target languages ~ are a desirable capability so that we can state …

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