Georg Rehm author Dimitris Galanis author Penny Labropoulou author Stelios Piperidis author Martin Welß author Ricardo Usbeck author Joachim Köhler author Miltos Deligiannis author Katerina Gkirtzou author Johannes Fischer author Christian Chiarcos author Nils Feldhus author Julian Moreno-Schneider author Florian Kintzel author Elena Montiel author Víctor Rodríguez Doncel author John Philip McCrae author David Laqua author Irina Patricia Theile author Christian Dittmar author Kalina Bontcheva author Ian Roberts author Andrejs Vasiļjevs author Andis Lagzdiņš author 2020-may text English eng European Language Resources Association Marseille, France conference publication 979-10-95546-64-1 With regard to the wider area of AI/LT platform interoperability, we concentrate on two core aspects: (1) cross-platform search and discovery of resources and services; (2) composition of cross-platform service workflows. We devise five different levels (of increasing complexity) of platform interoperability that we suggest to implement in a wider federation of AI/LT platforms. We illustrate the approach using the five emerging AI/LT platforms AI4EU, ELG, Lynx, QURATOR and SPEAKER. rehm-etal-2020-towards https://www.aclweb.org/anthology/2020.iwltp-1.15 2020-may 96 107