# The FraCaS GF Treebank

Authors: | Peter Ljunglöf Magdalena Siverbo
Version: | 0.2
Date: | 2012-01-27
Organization: | Centre for Language Technology, University of Gothenburg
Copyright: | Distributed under GNU GPL v3, see COPYING.txt for details

# 1. Introduction

This is the FraCaS Treebank, developed and maintained by the Centre for Language Technolgy at University of Gothenburg:

> http://www.clt.gu.se/

The treebank is part of the CLT Toolkit, a set of state-of-the-art open source Language Technology tools and accompanying linguistic resources. The different parts of the toolkit, including the FraCaS Treebank, can be downloaded from:

> http://www.clt.gu.se/clt-toolkit

The treebank is built upon the FraCaS textual inference problem set, which was built in the mid 1990’s by the FraCaS project, a large collaboration aimed at developing resources and theories for computational semantics. This test set was later modified and converted to XML by Bill MacCartney:

> http://www-nlp.stanford.edu/~wcmac/downloads/fracas.xml

It is this modified version that has been used in this treebank. The corpus consists of 346 problems each containing one or more statements and one yes/no-question (except for four problems, where there is no question). The total number of sentences in the corpus is 1220, but since some of them are repeated in several problems, there are in total 874 unique sentences.

# 2. Description

The treebank is created in Grammatical Framework (GF), using its multilingual Resource Grammar as backend grammar. Currently the treebank is bilingual, with an English and a Swedish lexicon.

More information about GF, including installation instructions, can be found at:

> http://www.grammaticalframework.org/

The treebank is also distributed in XML and Prolog formats, for people that have no interest in learning GF. Note however that the syntactical constructions come from the GF resource grammar.

# 3. Download and installation

The full distribution can be downloaded from dist/FraCaSBank-0.2.zip.

The Prolog and XML treebanks are already generated, so to use these you don't need anything else. But if you want to work with the GF source files, you need a GF installation including the Resource Grammar.

# 4. Contents

## a) Documentation

The documentation is located in the doc directory:

`FraCaSBank-report.{pdf,lyx,bib}`:
  A technical report describing the treebank, together with the LyX and BibTeX source files. The PDF version can be read here.

## b) GF source files

The grammar sources are located in the src directory:

`Additions*.gf`
  Generic additions to the GF Resource Grammar.
`FraCaS*.gf`
  Grammatical constructions specific to the FraCaS domain.
`FraCaSLex*.gf`
  The lexical items in the FraCaS treebank.
`FraCaSBank*.gf`
  The actual treebank. The file `FraCaSBankOriginal.gf` contains the original treebank sentences. The file `FraCaSBankI.gf` contains the language-independent abstract syntax trees.

## c) Other files

`Makefile, build_fracasbank.py`
  Files for automatically generating the XML and Prolog treebank.
`build/FraCaSBank.{xml,pl}`
  The automatically generated XML treebank and Prolog treebank.
`dist/FraCaSBank*.zip`
  All files collected in a zip file.
`README.txt, COPYING.txt`:
  The source of this README file, and GNU GPL 3 licensing information.