58In any event the concepts of ‘working time’ and ‘rest period’ within the meaning of Directive 93/104 may not be interpreted in accordance with the requirements of the various legislations of the Member States but constitute concepts of Community law which must be defined in accordance with objective characteristics by reference to the scheme and purpose of that directive, as the Court did at paragraphs 48 to 50 of the judgment in Simap. Only such an autonomous interpretation is capable of securing for that directive full efficacy and uniform application of those concepts in all the Member States.
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