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arXiv · 2606.24366

MorfFlex: Handling Rich Morphology

Jaroslava Hlaváčová·Marie Mikulová·Barbora Štěpánková·Milan Straka·Jan Hajič
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Abstract

We present MorfFlex, a morphological dictionary architecture suitable for languages with extensive regularity in both inflection and derivation. As the primary example of MorfFlex in use we introduce MorfFlex CZ, a morphological dictionary of Czech. It is distributed as a simple, unstructured list of triplets, however, its manually maintained, unpublished source files and conversion scripts encode a sophisticated system of inflectional and derivational patterns. These patterns dramatically reduce the otherwise enormous size of the dictionary, which currently contains over 100 million wordforms and more than 1 million lemmas. The MorfFlex CZ dictionary serves as an essential resource for ensuring the consistency of manual morphological annotation in the Prague Dependency Treebanks and underpins state-of-the-art automatic tools such as MorphoDiTa. In this paper, we focus on: (i) presenting an effective method for managing the rich morphological system within the dictionary, and (ii) demonstrating the utility of such a language resource for maintaining annotation consistency in corpora and supporting the development of advanced NLP applications.

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Jaroslava Hlaváčová, Marie Mikulová, Barbora Štěpánková, Milan Straka, Jan Hajič. 2026-06-23. MorfFlex: Handling Rich Morphology. https://doi.org/10.63317/36ruwkgu8iex

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