This
book constitutes the thoroughly refereed post conference proceedings of the
second edition of the Semantic Web Evaluation Challenge, SemWebEval 2015,
co-located with the 12th European Semantic Web conference, held in Portorož,
Slovenia, in May/June 2015.

This book includes the
descriptions of all methods and tools that competed at SemWebEval 2015,
together with a detailed description of the tasks, evaluation procedures and
datasets. The contributions are grouped in the areas: open knowledge extraction
challenge (OKE 2015); semantic publishing challenge (SemPub 2015);
schema-agnostic queries over large-schema databases challenge (SAQ 2015);
concept-level sentiment analysis challenge (CLSA 2015).