Analyses Tools for Non-head Structures

Proceedings of Recent Advances in Natural Language Processing, pages 686–691, Hissar, Bulgaria, 12-14 September 2011. Analyses Tools for Non-head Structures Sirine Boukédi Faculty of Sciences Economy and Management of Sfax Sirine.boukedi@gmail.com Kais Haddar Sciences Faculty of Sfax Kais.haddar@fss.rnu.tn Abstract Syntactic analysis is a fundamental phase in NLP (Natural Language Processing) do- main. This phase occurs in several applica- tions and at different levels. Moreover, it wasn’t spilled in domain research, espe- cially for Arabic language. In fact, most of researchers working on Arabic language treated simple structures and neglected complicated ones such as relatives, coordi- nation, ellipse and juxtaposition. In this con- text, the present work lies within the con- struction of a HPSG (Head-driven Phrase Structure Grammar) grammar treating Ara- bic coordination. The established grammar is specified on TDL (Type Description Lan- guage) and experimented with a parser gen- erated by LKB (Linguistic Knowledge Building) system. 1 Introduction The study on Arabic language showed that coor- dination is one of particular structures. It is fre- quent in different corpus and occurs with many other phenomena. The interaction with the other structures makes the study very delicate. For this reason, it wasn’t spilled in research domain. Based on a large literature, most of existing researchers treated coordination structure for Roman languages except some works such as (Haddar, 2000) and (Maaloul et al., 2004). In fact, Arabic coordination is very complicate. It covers many forms and different structures. Therefore, there is a big problem in the categori- zation of Arabic coordination. Moreover the last researchers found a problem in the choice of the adequate formalism repre- senting the different forms of coordination struc- tures. But most of related works used HPSG. The choice of this formalism is justified. In fact, HPSG offers a complete representation for lin- guistic entries. Therefore, our work aims to find an adequate typology classifying Arabic coordination struc- tures and to construct a HPSG grammar repre- senting the different forms of coordination. This grammar will be validated on LKB system. In the present paper, we start by describing some related works treating coordination struc- ture. Then, we adapted HPSG grammar to repre- sent the different forms of our phenomenon, based on a proposed typology. It should be noted that the established grammar treated simple sen- tences and complex ones representing the differ- ent forms of coordination except cases of interac- tion with ellipse phenomenon. Finally, we vali- dated our grammar on LKB system after specifi- cation in TDL. According to the obtained results, we evaluate our grammar and we enclose our work by a conclusion and some perspectives. 2 Previous works The study on previous works showed that re- searchers on coordination structure started since 1970, such as (Hudsan, 1976), (Postal, 1974) and (Rau, 1985), for many languages. The different researches used various grammars. Some works used the GCCA (Applicative Categorical Com- binatory Grammar), other works used GI (Inter- active Grammar) and other ones were based on HPSG Grammar. But most of them, used this last one …

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