Retrieval, Crawling and Fusion of Entity-centric Data on the Web -- Data Multiverse: The Uncertainty Challenge of Future Big Data Analytics -- Experiments with Document Retrieval from Small Text Collections using Latent Semantic Analysis or Term Similarity with Query Coordination and Automatic Relevance Feedback -- Unsupervised Extraction of Conceptual Keyphrases from Abstracts -- Back to the sketch-board: Integrating keyword search, semantics, and information retrieval -- Topic detection in multi-channel Italian newspapers -- Random Walks Analysis on Graph Modelled Multimodal Collections -- A software processing chain for evaluating thesaurus quality -- Comparison of Collaborative and Content-based Automatic Recommendation Approaches in a Digital Library of Serbian PhD Dissertations -- Keyword-based search on bilingual digital libraries -- Network-Enabled Keyword Extraction for Under-Resourced Languages -- Making sense of citations -- An Ontology-based Approach to Information Retrieval -- Gamewith a Purpose for Verification of Mappings Between Wikipedia and WordNet -- TB-Structure: Collective Intelligence for Exploratory Keyword Search -- Using Natural Language to Search Linked Data -- The Use of Semantics in the CrossCult H2020 Project. .

This book constitutes the thoroughly refereed post-conference proceedings of the Second COST Action IC1302 International KEYSTONE Conference on Semantic Keyword-Based Search on Structured Data Sources, IKC 2016, held in Cluj-Napoca, Romania, in September 2016. The 15 revised full papers and 2 invited papers are reviewed and selected from 18 initial submissions and cover the areas of keyword extraction, natural language searches, graph databases, information retrieval techniques for keyword search and document retrieval.