NLX - LX-Parser

Developed at the University of Lisbon, Dept. of Informatics, by the NLX-Natural Language and Speech Group.

Table of contents


LX-Parser is a statistical constituency parser for Portuguese. It performs a syntactic analysis of Portuguese sentences in terms of their constituency structure.

Online Demo

For an online demo of this tool, check here.


LX-Parser is being developed by Patricia Gonçalves and João Silva, managed by António Branco, by the NLX-Natural Language and Speech Group, partly in the scope of the SemanticShare Project, funded by FCT-Fundação para a Ciência e Tecnologia.


This work was partly supported by FCT-Fundation of Science and Technology under the grant FCT/PTDC/PLP/81157/2006 for the project SemanticShare.


When mentioning this parser, this is the reference to be used:


To use LX-Parser you must agree with its license.


LX-Parser is made available as a standalone parser that you can download and run locally in your computer.

Required downloads


Example command line:

java -Xmx500m -cp /path/to/stanford-parser.jar edu.stanford.nlp.parser.lexparser.LexicalizedParser -tokenized -sentences newline -outputFormat oneline -uwModel edu.stanford.nlp.parser.lexparser.BaseUnknownWordModel cintil.ser.gz input.txt

A quick explanation of the options:

Web service

To be available soon

Contact us

Contact us using the following email address: 'nlx' concatenated with 'at' concatenated with ''.

Why LX-Parser?

LX because LX is the "code" name Lisboners like to use to refer to their hometown.