The Application of HPSG-to-TAG Compilation Techniques

The HPSG-to-TAG compilation algorithm proposed in Kasper et al. (1995) has been the basis of large scale experiments in Verbmobil. The results presented here refer concentrate on the English HPSG grammar developed at CSLI. Several non-trivial theoretical problems have been discovered by the practical application of this algorithm. This paper presents these experiments, the main shortcomings of the initial algorithm and some of the solutions we have developed in order to use the resulting compiled LTAG (Lexicalized TAG) grammar in a real world system.