30Furthermore, the concepts of ‘working time’ and of ‘rest period’ are concepts of EU law which must be defined in accordance with objective characteristics by reference to the scheme and purpose of Directive 2003/88. Only an autonomous interpretation of that nature is capable of ensuring the full effectiveness of that directive and the uniform application of those concepts in all the Member States (see, to that effect, judgment of 9 September 2003, Jaeger, C‑151/02, EU:C:2003:437, paragraph 58).
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