An implementation of Dung's argumentation frameworks, an abstract argumentation model used to either directly represent conflicting information, or used as a translation target for more complex (structured) argumentation models. For an introduction to Dung's frameworks see http://en.wikipedia.org/wiki/Argumentation_framework and Dung's paper from 1995: "On the acceptability of arguments and its fundamental role in nonmonotonic reasoning, logic programming, and n-person games", Artificial Intelligence 77: 321-357. For the papers accompanying this library see "Towards a framework for the implementation and verification of translations between argumentation models" and "A principled approach to the implementation of argumentation models", available at https://scholar.google.com/citations?user=Xu4yjvwAAAAJ&hl.