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A Survey on Decidable Equivalence Problems for Tree Transducers
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The decidability of equivalence for three important classes of tree transducers is discussed. Each class can be obtained as a natural restriction of deterministic macro tree transducers (MTTs): (1) no context parameters, i.e., top-down tree transducers, (2) linear size increase, i.e., MSO definable tree transducers, and (3) monadic input and output ranked alphabets. For the full class of mtts, decidability of equivalence remains a long-standing open problem.
World Scientific Pub Co Pte Lt
Title: A Survey on Decidable Equivalence Problems for Tree Transducers
Description:
The decidability of equivalence for three important classes of tree transducers is discussed.
Each class can be obtained as a natural restriction of deterministic macro tree transducers (MTTs): (1) no context parameters, i.
e.
, top-down tree transducers, (2) linear size increase, i.
e.
, MSO definable tree transducers, and (3) monadic input and output ranked alphabets.
For the full class of mtts, decidability of equivalence remains a long-standing open problem.
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