Extended Multi Bottom-Up Tree Transducers

  • Authors:
  • Joost Engelfriet;Eric Lilin;Andreas Maletti

  • Affiliations:
  • Leiden Institute of Advanced Computer Science, Leiden University, Leiden, The Netherlands 2300 RA;Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France UFR IEEA 59655;International Computer Science Institute, Berkeley, USA CA 94704

  • Venue:
  • DLT '08 Proceedings of the 12th international conference on Developments in Language Theory
  • Year:
  • 2008

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Abstract

Extended multi bottom-up tree transducers are defined and investigated. They are an extension of multi bottom-up tree transducers by arbitrary, not just shallow, left-hand sides of rules; this includes rules that do not consume input. It is shown that such transducers can compute any transformation that is computed by a linear extended top-down tree transducer. Moreover, the classical composition results for bottom-up tree transducers are generalized to extended multi bottom-up tree transducers. Finally, a characterization in terms of extended top-down tree transducers is presented.