LX-SRLabeler is a freely available on-line service for constituency parsing and semantic role labeling of Portuguese sentences. This service was developed and is maintained at University of Lisbon by the NLX-Natural Language and Speech Group of the Department of Informatics.

LX-SRLabeler is supported by other tools developed at the NLX-Natural Language and Speech Group, including the LX-Parser and the LX-DepParser.
Version 4 of the CINTIL-Treebank was used for training. This treebank can be searched with the CINTIL Treebank Searcher.
The SRLabeler uses probabilistic grammars. It achieves an f-score of 70% in Parseval metric (value obtained through 10-fold cross-evaluation).