brat rapid annotation tool, is a free, open-source, web-based tool for text annotation visualisation and editing.
brat is fully configurable and can support a wide variety of annotation tasks, including, for example:
* entity mention ("named entity") annotation
* binary relation annotation
* dependency syntactic annotation
* structured, n-ary event annotation
* attribute/meta-knowledge annotation (e.g. negation, speculation, etc.)
The tool also provides annotation support features such as text and annotation search with detailed constraints, keyword-in-context concordancing, and integrated configurable checking of task-specific semantic constraints.
brat is developed as a collaborative effort between several research groups as an open source project (MIT license), and we warmly welcome contributions and participation from the community, including feature requests.
University of Tokyo
National Centre for Text Mining
National Institute of Informatics
Pontus Stenetorp, Sampo Pyysalo, Goran Topić, Tomoko Ohta, Sophia Ananiadou and Jun’ichi Tsujii. brat: a Web-based Tool for NLP-Assisted Text Annotation. In Proceedings of the Demonstrations Sessions at EACL 2012, Avignon, France, April 2012. European Chapter of the Association for Computational Linguistics.