WebAnno

 

WebAnno is a general purpose web-based annotation tool for a wide range of linguistic annotations. WebAnno offers annotation project management, freely configurable tagsets and the management of users in different roles. WebAnno uses technology from the brat rapid annotation tool for visualizing and editing annotations in a web browser. It supports annotation and visualization of arbitrarily large documents, pluggable import/export filters, the curation of annotations across various users, and farming out annotations to a crowdsourcing platform.

Currently, WebAnno allows POS, Named Entity, Dependency Parsing and co-reference resolution annotations. The architecture design allows to add additional modes of visualization and editing, when new kinds of annotations are to be supported.

The added value of WebAnno, as compared to previous annotation tools, is on the one hand constituted by its web-based interface to skilled as well as unskilled annotators, which unlocks a potentially very large workforce. On the other hand, the tool's support functionality for quality control and annotator management and curation lowers the entrance barrier for new annotation projects.

We created WebAnno to fulfill the following requirements:

  • Flexibility: Support of several annotation layers, several import and export formats, and extendibility to other frontends.
  • Web-based: Increased availability, distributed work, no installation effort.
  • Open Source: Usability of our tool in future projects without restrictions, under the Apache 2.0 license.
  • Quality and User Management: Integrated different user roles (administrator, annotator, and curator) support for several users, inter-annotator agreement measurement, data curation, and progress monitoring.
  • Interface to Crowdsourcing: unlocking a very large distributed workforce.
  • Pre-annotated and un-annotated documents: supporting new annotations, as well as manual corrections of automatic annotations.

Downloads

The source code is provided under the Apache Software License (ASL) version 2.

Publications

A Web-based Tool for the Integrated Annotation of Semantic and Syntactic Structures

Author Richard Eckart de Castilho, Éva Mújdricza-Maydt, Seid Muhie Yimam, Silvana Hartmann, Iryna Gurevych, Anette Frank, Chris Biemann
Date December 2016
Kind Inproceedings
Book titleProceedings of the workshop on Language Technology Resources and Tools for Digital Humanities (LT4DH) at COLING 2016
Pages76--84
LocationOsaka, Japan
KeyTUD-CS-2016-14655
Research Areas Ubiquitous Knowledge Processing, AIPHES, UKP_s_WebAnno, UKP_reviewed, UKP_p_CLARIND
Abstract We introduce the third major release of WebAnno, a generic web-based annotation tool for distributed teams. New features in this release focus on semantic annotation tasks (e.g. semantic role labelling or event annotation) and allow the tight integration of semantic annotations with syntactic annotations. In particular, we introduce the concept of slot features, a novel constraint mechanism that allows modelling the interaction between semantic and syntactic annotations, as well as a new annotation user interface. The new features were developed and used in an annotation project for semantic roles on German texts. The paper briefly introduces this project and reports on experiences performing annotations with the new tool. On a comparative evaluation, our tool reaches significant speedups over WebAnno 2 for a semantic annotation task.
Website https://webanno.github.io/webanno/
Full paper (pdf)
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