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Thisbook constitutes the thoroughly refereed post conference proceedings of thesecond edition of the Semantic Web Evaluation Challenge, SemWebEval 2015,co-located with the 12th European Semantic Web conference, held in Portoroz,Slovenia, in May/June 2015. This book includes thedescriptions of all methods and tools that competed at SemWebEval 2015,together with a detailed description of the tasks, evaluation procedures anddatasets. The contributions are grouped in the areas: open knowledge extractionchallenge (OKE 2015); semantic publishing challenge (SemPub 2015);schema-agnostic queries over large-schema databases challenge (SAQ 2015);concept-level sentiment analysis challenge (CLSA 2015).