The provider performs the role of the DiDok specialist unit. Within the Swiss Union of Public Transport and within the framework of international interoperability, the specialist unit ensures that the services are defined clearly and in the same way technically and that they can be made available to the licensed transport companies and the public based on art. 34 of the Ordinance of 21 May 2008 on Geographical Names (GeoNo) as a directory of station names. The specialist unit operates and maintains an IT system (services documentation DiDok) in order to perform this role.