Deep Analysis of Modern Greek Valia Kordoni and Julia Neu Department of Computational Linguistics, Saarland University D-66041, Saarbr¨ ucken, Germany {kordoni,neu}@coli.uni-sb.de Abstract. We present a deep computational Modern Greek grammar. The grammar is written in HPSG and is being developed in a multilingual context with MRS semantics, contributing to an open-source collection of software and linguistic resources with wide usage in research, education, and application building. 1 Introduction In this paper we describe the development of a large grammar fragment of Mod- ern Greek in a multilingual context. The grammar is couched in the theoretical framework of HPSG (Head-Driven Phrase Structure Grammar; [1]) and benefits from an organization of semantics based on MRS (Minimal Recursion Semantics; [2], [3]). MRS, a framework for computational semantics, in which the meaning of ex- pressions is represented as a flat bag of Elementary Predications (EPs), combines naturally with typed feature structures, like the ones used in HPSG, and allows for structures which are underspecified for scopal information and can be com- pared across languages. HPSG itself is also suitable for multilingual grammar development, since the analyses in the extensive literature written in it can be shared across languages, but also parametrized accordingly, and its characteristic type hierarchy enables the writing of grammars that are easy to extend. More- over, there are by now many useful open-source tools for writing, testing, and efficiently processing grammars written in HPSG and MRS: the LKB system for grammar development [4], [incr tsdb()] for testing grammars and tracking changes [5], and PET, a very efficient HPSG parser for processing [6]. The tool we use for the development, i.e., the writing and the testing of the Modern Greek grammar is the Grammar Matrix [7], an open source tool designed for the rapid development of multilingual broad coverage grammars couched in HPSG and MRS and based on LKB. In the following we focus on some detailed examples from the deep Modern Greek grammar we have been developing since January 2003 using the Grammar Matrix, as part of the DELPHIN Collaboration (Deep Linguistic Processing with HPSG: An International Collaboration; for more see http://www.delph-in.net/), which currently involves research groups from DFKI in Saarbr¨ ucken, Saarland University, Stanford University, Tokyo University, the University of Sussex, Cam- bridge University, and the University of Trondheim, and whose main current re- search takes place in three areas: (i) robustness, disambiguation and specificity K.-Y. Su et al. (Eds.): IJCNLP 2004, LNAI 3248, pp. 674–683, 2005. c  Springer-Verlag Berlin Heidelberg 2005