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Multi-Phase Tree Transformations
Akio FUJIYOSHI Takumi KASAI
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/04/25
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Thought and Language
tree transducer, computational linguistics,
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In this paper, we introduce a computational mode of a tree transducer called a bi-stage transducer and study its properties. We consider a mapping on trees realized by composition of any sequence of top-down transducers and bottom-up transducers, and call such a mapping a multi-phase tree transformation. We think a multi-phase tree transformation is sufficiently powerful. It is shown that in the case of rank-preserving transducers, a multi-phase tree transformation is realized by a bi-stage transducer.