Darmstadt Service Review Corpus
The Darmstadt Service Review Corpus consists of consumer reviews annotated with opinion related information at the sentence and expression levels.
Details regarding the creation of the data can be found in the following paper:
Cigdem Toprak, Niklas Jakob, Iryna Gurevych: Sentence and Expression Level Annotation of Opinions in User-Generated Discourse. In: Proceedings of the 48th Annual Meeting of the Association for Computational Linguistics, p. 575 -- 584, Association for Computational Linguistics, July 2010.