. "Concept scheme grouping harmonized restrictions. The structure of a restriction code is a combination of [Category].[Type].[Value or specification]."@en . . "2022-09-09"^^ . "Controlled SKOS-based vocabularies defined by the European Union Agency for Railways to describe concepts related to the European railway infrastructure and the vehicles authorized to operate over it."@en . "2020-09-01"^^ . "Restrictions"@en .