Click here to download MultiLingua, a natural language parser implemented with Perl. Machine requirements are the following:

• A linux distribution
• Perl interpreter in /usr/bin
• (Optional) POS tagger Freeling

This is a robust and partial parser. The implementation is based on finite-state cascades. It is a multilingual system. It processes 5 languages:

• English (treetagger, freeling)
• Spanish (treetagger, freeling)
• Galician (treetagger, freeling)
• French (treetagger)
• Portuguese (treetagger)

• (1) tar xzvf MultiLingua.tgz
• (2) sh install-multilingua.sh

Installation provides you with the parameter files required by Tree-Tagger

./parser_ml.sh <tagger> <lang> <input_file>

tagger = freeling, treetagger

lang = gl, es, en, pt, fr

Note: if Freeling has not been installed, don't use flag 'freeling'.

The input file is just plain text. File codification must be ISO-8859-1.

The system parses sentence by sentence. Each parsed sentence consists of two elements:

• a line containing the POS tagged lemmas of the sentence. This line begins with the tag SENT. The set of tags used here are listed in file TagSet.txt. All lemmas are identified by means of a position number from 1 to N, where N is the size of the sentence.
• all dependency triplets identified by the grammar. A triplet consists of:

(relation;head_lemma;dependent_lemma)

For instance, the sentence "I am a man." gives rise to:

SENT::<I_PN_0 be_VERBFCOP_1 a_DT_2 man_NOM_3>

(Lobj;be_VERBF_1;I_PN_0)

(Spec;man_NOM_3;a_DT_2)

(Robj;be_VERBF_1;man_NOM_3)

The set of dependency relationships used by the 5 grammars can be consulted in file DependencySet.txt. The 5 grammars share the same set of dependencies.

It is also possible to get an output file with the format defined by CoNLL-X, inspired by Lin (1998):

This format was adopted by the evaluation tasks defined in CoNLL.

To get this ouput format file, you have to run ./scripts/saidaCoNLL.perl taking as input the standard output file.

You can use the output of the parser to build a cooccurrences file. This file contains all coocurrences between lemmas and dependency contexts. It consists of 3 columns:

<context> <lemma> <frequency>

To generate this cooccurrence information, you have to run ./scripts/contextsDep.perl, taking as input the standard output file.