“…However, the complexity of knowledge found in open data sources requires powerful, flexible ways for users to retrieve, analyze and understand the data, as well as produce and share complex annotations on the analyzed documents. Existing tools let users annotate Web pages directly from their browser, e.g., Dispute Finder [6] helps distributed users annotate pages to uncover disputed content or use it as supporting evidence for other claims. Closer to our work, DocumentCloud [7] provides an online service for newsrooms, where users create collections of documents, analyze and annotate them, share annotations, etc.…”