Preface of the 18th European Networked Knowledge Organization Systems Workshop (NKOS 2018) Philipp Mayr1 , Douglas Tudhope2 , Joseph Busch3 , Koraljka Golub4 , Marjorie Hlava5 , and Marcia Zeng6 1 GESIS – Leibniz-Institute for the Social Sciences, Cologne, Germany philipp.mayr@gesis.org 2 Hypermedia Research Group, Faculty of Computing, Engineering and Science, University of South Wales, UK douglas.tudhope@southwales.ac.uk 3 Taxonomy Strategies, 5253 Nebraska Ave NW, Washington, D.C. 20015, USA jbusch@taxonomystrategies.com 4 Department of Library and Information Science, School of Cultural Sciences, Faculty of Arts and Humanities, Linnaeus University, Sweden Koraljka.golub@lnu.se 5 Access Innovations, 6301 Indian School Road NE, Suite 400, Albuquerque, New Mexico, 87110, USA mhlava@accessinn.com 6 School of Information, Kent State University, Kent, Ohio 44240, USA mzeng@kent.edu 1 Introduction This preface describes the workshop outline and overview of presented papers at the 18th European Networked Knowledge Organization Systems Workshop (NKOS 2018)7 which was held during the joint DCMI 2018 and TPDL 2018 Conference in Porto, Portugal. This workshop builds on the well-attended NKOS workshops at previous ECDL, TPDL, JCDL conferences (see NKOS website8 for details). Knowledge Organization Systems (KOS), in the form of classification sys- tems, thesauri, lexical databases, ontologies, and taxonomies, play a crucial role in digital information management and applications generally. Carrying seman- tics in a well-controlled and documented way, Knowledge Organization Systems serve a variety of important functions: tools for representation and indexing of in- formation and documents, knowledge-based support for information searchers, semantic road maps to domains and disciplines, communication tools by pro- viding a conceptual framework, and the conceptual basis for knowledge based systems, e.g. automated classification systems. New networked KOS (NKOS) ser- vices and applications are emerging, and we have reached a stage where many 7 https://at-web1.comp.glam.ac.uk/pages/research/hypermedia/nkos/ nkos2018/ 8 http://hypermedia.research.southwales.ac.uk/kos/nkos/ 2 Mayr et al. KOS standards exist and the integration of linked services is no longer just a future scenario [2]. 2 Workshop outline As with the previous workshops, the workshop at TPDL 2018 has three themes as the main focus, together with topical presentations arising from the workshop call for papers9 . 1. Alignment/enrichment of metadata to existing KOS Linked Open Data. Re- cent years have seen an increasing trend to publication of KOS as Linked Data vocabularies. We need discussion of relevant issues and examples of KOS-driven metadata enrichment for a variety of data collection providers, including libraries, archives, museums, publishers, government agencies, in- ternational organizations, and also commercial organizations. 2. KOS alignment/interoperability. KOS alignment or terminology mapping has been playing a vital role in NKOS for many years. We continue this theme with discussion of specific case studies. 3. Automatic KOS-based subject indexing / classification /entity-extracting is a classic KOS topic which has seen renewed interest regarding evaluation methodologies. 3 Overview of the papers The workshop featured an introduction and three paper sessions. The NKOS organizers have accepted seven regular papers and two invited reports for pre- sentation. All regular papers are included in the CEUR workshop proceedings. In the following we shortly list each workshop paper. – Automatic Classification Using DDC on the Swedish Union Catalogue. Koraljka Golub, Johan Hagelbäck and Anders Ardö – Automated KOS-based Subject Indexing in INIS. Zaven Hakopov, Dmitry Mironov, Dobrica Savic and Yulia Svetashova – Knowledge Node and Relation Detection. Jian Qin, Bei Yu and Liya Wang – Traveling through Space and Time, or: Making Historical Travelogues Acces- sible. Jan Rörden, Bernhard Haslhofer, Rainer Simon and Sven Schlarb – Reflections on KOS based data alignment. Douglas Tudhope and Ceri Binding – Full of beans: a study on the alignment of two flowering plants classification systems. Yi-Yun Cheng and Bertram Ludaescher 9 https://at-web1.comp.glam.ac.uk/pages/research/hypermedia/nkos/ nkos2018/call-for-papers.html Preface: NKOS workshop at TPDL 2018 3 – Cleaning up a legacy thesaurus to make it fit for transformation into a Se- mantic Web KOS. Anna Kasprzik The workshop features two invited reports which are not included in the proceedings. The invited presentation by Marcia Zeng and Philipp Mayr will give insights on two recently published papers by the authors in the International Journal on Digital Libraries [3, 1]. – LOD KOS interoperability and NKOS network structure analyses. Marcia Zeng and Philipp Mayr – Report on KOS developments from USA and Asia/Pacific communities. Joseph Busch and Marcia Zeng 4 Acknowledgment We are indebted to the referees who contributed to the review process of this workshop and previous NKOS events. We especially would like to thank our long-term collaborator Ceri Binding (University of South Wales, UK) for his effort in hosting and updating the workshop website. References 1. Karimi, F., Mayr, P., Momeni, F.: Analyzing the network structure and gen- der differences among the members of the Networked Knowledge Organization Systems (NKOS) community. International Journal on Digital Libraries (2018), http://arxiv.org/abs/1803.04225 2. Mayr, P., Tudhope, D., Clarke, S.D., Zeng, M.L., Lin, X.: Recent applications of Knowledge Organization Systems: introduction to a special issue. International Journal on Digital Libraries 17(1), 1–4 (2016), http://link.springer.com/10. 1007/s00799-015-0167-x 3. Zeng, M.L., Mayr, P.: Knowledge Organization Systems (KOS) in the Semantic Web: A Multi-Dimensional Review. International Journal on Digital Libraries (2018), https://arxiv.org/abs/1801.04479