60 Int. J. Metadata, Semantics and Ontologies, Vol. 15, No. 1, 2021 Copyright © 2021 Inderscience Enterprises Ltd. Children’s art museum collections as Linked Open Data Konstantinos Kotis* and Sotiris Angelis Department of Cultural Technology and Communication, University of the Aegean, Lesvos, Mytilene, Greece Email: kotis@aegean.gr Email: sotiris@aegean.gr *Corresponding author Maria Chondrogianni and Efstathia Marini Department of Cultural Technology and Communication, University of the Aegean, Lesvos, Mytilene, Greece and Greek Children’s Art Museum, Plaka, Athens, Greece Email: ctm19027@ct.aegean.gr Email: ctm19017@ct.aegean.gr Abstract: It has been recently argued that it is rather beneficial to cultural institutions to provide their datasets as Linked Open Data, to achieve cross-referencing, interlinking, and integration with other datasets in the LOD cloud. In this paper, we present the Greek Children’s Art Museum (GCAM) linked dataset, along with dataset and vocabulary statistics, as well as lessons learned from the process of transforming the collections to HTML-embedded structured data using the Europeana Data Model and the Schema.org model. The dataset consists of three cultural collections of 121 child artworks (paintings), including detailed descriptions and interlinks to external datasets. In addition to the presentation of GCAM data and the lessons learned from the experimentation of non-ICT experts with LOD paradigm, the paper introduces a new metric for measuring datasets quality in terms of links to and from other datasets. Keywords: Linked Open Data; HTML-embedded RDF; RDFa; microdata; museum; artwork. Reference to this paper should be made as follows: Kotis, K., Angelis, S., Chondrogianni, M. and Marini, E. (2021) ‘Children’s art museum collections as Linked Open Data’, Int. J. Metadata Semantics and Ontologies, Vol. 15, No. 1, pp.60–70. Biographical notes: Konstantinos Kotis is currently an Assistant Professor in the Department of Cultural Technology and Communication and in Intelligent Systems Lab at the University of the Aegean, and a Research Associate in the Department of Digital Systems and in AI Lab at the University of Piraeus. His research interests include knowledge/ontology engineering, Semantic Web technologies, semantic data management, the web of things and conversational AI. He has published more than 60 papers in peer-reviewed international journals and conferences, and has served as a reviewer and PC member in several journals and conference events. He has also contributed to several national and European projects in different roles/positions. For more, please visit: http://i-lab.aegean.gr/kotis. Sotiris Angelis is currently a PhD candidate and a Member of i-Lab in the Department of Cultural Technology and Communication at the University of the Aegean. His research interests focus on Semantic Web, cultural data integration, semantic trajectories and recommendation systems. He received his Master’s degree in “Cultural Informatics and Communication” from the same Department, where he studied web, mobile application and game design. He holds a Dipl.-Ing. degree in the Department of Electrical and Computer Engineering from Aristotle University of Thessaloniki. His background includes experience in software engineering, web development, and digital systems.