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Knowledge on the Web, and in society in general, is diverse: it is mutli-cultural, multithematic, multi-perspective, multi-medial, multidimensional, and distributed over time, space, and various contexts. This offers rich opportunities to gain a better and more holistic understanding of complex processes, both physical and social, which require analysis of many of these sources in integrative ways. EKAW 2014, the 19th International Conference on Knowledge Engineering and Knowledge Management, held in November 2014 in Linkoping, Sweden, put a particular emphasis on the heterogeneity in the nature and usage of knowledge. This special issue collects extended full papers from this conferences that investigate novel knowledge engineering and management methods for constructing, extracting, visualizing, reusing, and integrating data in its various forms and provenances. The scientific program of EKAW 2014 was organized by Eero Hyvonen from Aalto University, Finland and Patrick Lambrix from Link ̈oping University, Sweden, as general chairs and Krzysztof Janowicz from the University of California, Santa Barbara, USA, and Stefan Schlobach from the Vrije Universiteit Amsterdam, The Netherlands as program chairs. EKAW 2014 had two parallel submission tracks: a conference only submission, for which proceedings were published in 2014, and a special journal track. With its open and transparent reviewing this journal track followed the Semantic Web journal’s publishing model. All in all 32% of the 168 submissions were to this joins track and merely 7 papers were in the end invited to extend their conference papers toward a full journal paper. These selected papers had then to undergo at least one more round of reviews. The paper Distantly Supervised Web Relation Extraction for Knowledge Base Population, written by Isabelle Augenstein, Diana Maynard and Fabio Ciravegna investigates relation extraction from the Web using distant supervision, in particular addressing some core issues of this approach, namely sparsity, noise and ambiguity. In their paper From hyperlinks to Semantic Web properties using Open Knowledge Extraction Valentina Presutti, Andrea Giovanni Nuzzolese, Sergio Consoli, Diego Regorgiato Recupero and Aldo Gangemi base their extraction method on existing hyperlinks on the Web and focus on the sentences that surround these links for building semantic relations. While crowdsourcing has now become a standard tool in knowledge engineering, e.g. for evaluation as in the previous paper, it is still cumbersome to be integrated in the standard work-flow of knowledge engineers. The paper Crowd-based Ontology Engineering with the uComp Protege Plugin by Gerhard Wohlgenannt, Marta Sabou and Florian Hanika introduces a plug-in for Protégé, and describes an extensive evaluation on a number of engineering tasks. Another Protégé plug-in is described in the paper Visualizing Ontologies with VOWL by Steffen Lohmann, Stefan Negru, Florian Haag and Thomas Ertl, which describes two implementations of the visuals language VOWL, or Visual Notation for OWL Ontologies. The systems and ap-

Selected papers from the combined EKAW 2014 and Semantic Web journal track