15In that regard it should be noted, first, that, according to the Court’s settled case-law, the entitlement of every worker to paid annual leave must be regarded as a particularly important principle of European Union social law from which there may 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, that directive having been codified by Directive 2003/88 (see Schultz-Hoff and Others, C‑350/06 and C‑520/06, EU:C:2009:18, paragraph 22 ; KHS, C‑214/10, EU:C:2011:761, paragraph 23; and Dominguez, C‑282/10, EU:C:2012:33, paragraph 16).
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