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near real-time collaboration shared editing yjs peer-to-peer acis community information system widget-based application icwe2015 widgetizing syncmeta webrtc xmpp group editing operational transformation video annotation semantic video annotation rwth aachen university informal learning struts frontend methodology jtelss13 distributing user interfaces collaborative modelling; ims learning design; near icwe15 collaborative annotations; web based video annotat scaffolding learning layers cloud infrastructure ach so! sevianno icalt 2014 cloud computing yata y-js.org crdt group2016 cscw viewpoint conceptual modeling collaboration collaborative modeling view-based modeling 3d object annotation rwth aachen role sdk web-based 3d object annotation las2peer microservice architecture x3dom x3d collaborative annotations 3d objects i* collaborative modelling collaborative metamodeling ims learning design i star jtelss15 adaptive video conflict resolution