Additional parsing features

[mheilman]

We should add features based on syntactic structures, EDUs being in the same sentence, etc. Here are some recent papers to glean ideas from:

@article{hernault-etal:2010,
  author = {Hugo Hernault and Helmut Prendinger and David A. duVerle and Mitsuru Ishizuka},
  year = 2010,
  journal = {Dialogue and Discourse},
  volume = 1,
  number = 3,
  pages = {1--33}
}

@InProceedings{feng-hirst:2012:ACL2012,
  author    = {Feng, Vanessa Wei  and  Hirst, Graeme},
  title     = {Text-level Discourse Parsing with Rich Linguistic Features},
  booktitle = {Proceedings of the 50th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  month     = {July},
  year      = {2012},
  address   = {Jeju Island, Korea},
  publisher = {Association for Computational Linguistics},
  pages     = {60--68},
  url       = {http://www.aclweb.org/anthology/P12-1007}
}

@InProceedings{ji-eisenstein:2014:ACL2014,
    author = {Yangfeng Ji and Jacob Eisenstein},
    title = {Representation Learning for Text-level Discourse Parsing},
    booktitle = {Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics},
    year = {2014},
    url = {http://www.cc.gatech.edu/~jeisenst/papers/ji-acl-2014.pdf},
    comment = {This entry should be updated once the official proceedings are available online.}
}

@InProceedings{sagae:2009:IWPT09,
  author    = {Sagae, Kenji},
  title     = {Analysis of Discourse Structure with Syntactic Dependencies and Data-Driven Shift-Reduce Parsing},
  booktitle = {Proceedings of the 11th International Conference on Parsing Technologies (IWPT'09)},
  month     = {October},
  year      = {2009},
  address   = {Paris, France},
  publisher = {Association for Computational Linguistics},
  pages     = {81--84},
  url       = {http://www.aclweb.org/anthology/W09-3813}
}