The Penn Treebank Project Release 2 CDROM features the new Penn
Treebank II bracketing style, which is designed to allow the
extraction of simple predicate/argument structure. Over one million
words of text are provided with this bracketing applied, along with
a complete style manual explaining the bracketing, and new versions
of tools for searching and treating bracketed data.
This CDROM also contains all the annotated text material from the
earlier Treebank Preliminary Release, including the Brown Corpus.
While these materials have not all been converted to the newer
bracketing style, they have been cleaned up to remove problems that
had appeared in the earlier release.
The contents of Treebank Release 2 are as follows:
- 1 million words of 1989 Wall Street Journal material annotated in
Treebank II style.
- A small sample of ATIS-3 material annotated in Treebank II style.
- 300-page style manual for Treebank II bracketing, as well as the
part-of-speech tagging guidelines.
- Tools for processing Treebank data, including a new version of
tgrep (a tree-searching and manipulation package).
- The contents of the previous Treebank CDROM (Version 0.5), with
cleaner versions of the WSJ, Brown Corpus, and ATIS material
(annotated in Treebank I style).
Updated information on this release will be issued periodically.
Treebank 2 bracketing style is described in
The Penn Treebank: Annotating predicate argument structure.
Treebank I style (used on the Version 0.5 CDROM) is described in
Building a large annotated corpus of English: The Penn Treebank
Detailed questions about the corpus may be sent to
treebank@unagi.cis.upenn.edu,
while questions and requests for obtaining Treebank Release 2 should be sent to
Linguistic Data Consortium.