27Having regard to the objectives pursued by the framework agreement, clause 4 of that agreement must be understood as expressing a principle of EU social law which cannot be interpreted restrictively (judgments of 13 September 2007, Del Cerro Alonso, C‑307/05, EU:C:2007:509, paragraph 38; of 22 December 2010, Gavieiro Gavieiro and Iglesias Torres, C‑444/09 and C‑456/09, EU:C:2010:819, paragraph 49, and of 13 March 2014, Nierodzik, C‑38/13, EU:C:2014:152, paragraph 24).
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