Towards an Interoperable Ecosystem of AI and LT Platforms: A Roadmap for the Implementation of Different Levels of Interoperability. - Georg Rehm; Dimitris Galanis; Penny Labropoulou; Stelios Piperidis; Martin Welß; Ricardo Usbeck; Joachim Köhler; Miltos Deligiannis; Katerina Gkirtzou; Johannes Fischer 006; Christian Chiarcos; Nils Feldhus; et al. (IWLTP@LREC, 2020)