This book constitutes the thoroughly refereed
post-conference proceedings of the First COST Action IC1302 International
KEYSTONE Conference on semantic Keyword-based Search on Structured Data Sources,
IKC 2015, held in Coimbra, Portugal, in September 2015.

The 13 revised full papers, 3 revised short papers, and 2 invited papers were
carefully reviewed and selected from 22 initial submissions. The paper topics
cover techniques for keyword search, semantic data management, social Web and
social media, information retrieval, benchmarking for search on big data.