28In that regard, it is important to note first that, according to settled case-law, the right of every worker to paid annual leave must be regarded as a particularly important principle of European Union social law from which there can be no derogations and whose implementation by the competent national authorities must be confined within the limits expressly laid down by Council Directive 93/104/EC of 23 November 1993 concerning certain aspects of the organisation of working time (OJ 1993 L 307, p. 18) itself (see Case C-173/99 BECTU [2001] ECR I-4881, paragraph 43; Case C-342/01 Merino Gómez [2004] ECR I-2605, paragraph 29; and Joined Cases C-131/04 and C-257/04 Robinson-Steele and Others [2006] ECR I-2531, paragraph 48; and regarding Directive 2003/88, see Joined Cases C-350/06 and C-520/06 Schultz-Hoff and Others [2009] ECR I-179, paragraph 22, and Case C-277/08 Vicente Pereda [2009] ECR I-8405, paragraph 18).
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