Shape Preserving Tree Transducers

Published 27 Jun 2025 in cs.FL | (2506.22047v1)

Abstract: It is shown that shape preservation is decidable for top-down tree transducers, bottom-up tree transducers, and for compositions of total deterministic macro tree transducers. Moreover, if a transducer is shape preserving, then it can be brought into a particular normal form, where every input node creates exactly one output node.

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Generalization to nondeterministic macro tree transducers

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