A Spanish judge has asked Europe's top court if online taxi-hailing app Uber is a "mere transport service" or a digital service, as the U.S. start-up claims, in a case that could set a precedent for legal battles across the continent. A judge in Barcelona has referred a case brought by the city's main taxi operator against Uber towards the end of last year to the European Court of Justice (ECJ) in Luxembourg, an Uber executive said.
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