TY  - JOUR
A1  - Maletti, Andreas
A1  - Graehl, Jonathan
A1  - Hopkins, Mark
A1  - Knight, Kevin
T1  - The power of extended top-down tree transducers
N2  - Extended top-down tree transducers (transducteurs generalises descendants; see [A. Arnold and M. Dauchet, Bi- transductions de forets, in Proceedings of the 3rd International Colloquium on Automata, Languages and Programming, Edinburgh University Press, Edinburgh, 1976, pp. 74-86]) received renewed interest in the field of natural language processing. Here those transducers are extensively and systematically studied. Their main properties are identified and their relation to classical top-down tree transducers is exactly characterized. The obtained properties completely explain the Hasse diagram of the induced classes of tree transformations. In addition, it is shown that most interesting classes of transformations computed by extended top-down tree transducers are not closed under composition.
Y1  - 2009
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/31782
UR  - http://epubs.siam.org/SICOMP/
SN  - 0097-5397
ER  -