23The framework agreement, in particular clause 4 thereof, aims to apply the principle of non-discrimination to fixed-term workers in order to prevent an employer using such an employment relationship to deny those workers rights which are recognised for permanent workers (Case C-307/05 Del Cerro Alonso [2007] ECR I-7109, paragraph 37, and Gaviero Gaviero and Igliesias Torres, paragraph 48).
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