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The Application of Two-Level Morphology to Non-Concatenative German Morphology

Harald Trost
In: Hans Karlgren (Hrsg.). Proceedings of the13th International Conference on Computational Linguistics (COLING '90). International Conference on Computational Linguistics (COLING), 13th, August 20-25, Helsinki, Finland, Pages 371-376, Vol. 2, University of Helsinki, 1990.


In this paper we describe a hybrid system for morphological analysis and synthesis. We call it hybrid because it consists of two separate parts interacting with each other in a welldefined way. The treatment of morphonology and nonoconcatenative morphology is based on the two-level approach originally proposed by Koskenniemi (1983). For the concatenative part of morphosyntax (i.e. affixation) we make use of a grammar based on feature-unification. tloth parts rely on the same morph lexicon. Conventional morphosyntactic grammars do not allow to describe non-concatenative parts of morphology declaratively. Two-level morphology on the other hand can deal with some of these phenomena like vowel or consonant change, but there is no sound way to transmit information to the morphosyntactic grammar. This leads to quite unnatural solutions like the use of diacritics for the representation of morphosyntactic phenomena.

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