This book constitutes the thoroughly refereed proceedings of the 11th International Conference on Metadata and Semantic Research, MTSR 2017 2017, held in Tallinn, Estonia, November 28th to December 1st, 2017. The 18 full and 13 short papers presented were carefully reviewed and selected from 58 submissions. They focus on the Internet of Things (IoT) and the practical implementation of ontologies and linked data. Further topics are theoretical and foundational principles of metadata; ontologies and information organization; applications of linked data, open data, big data and user-generated metadata; digital interconnectedness; metadata standardization; authority control and interoperability in digital libraries and research data repositories; emerging issues in RDF, OWL, SKOS, schema.org, BIBFRAME, metadata and ontology design; linked data applications for e-books; digital publishing and Content Management Systems (CMSs); content discovery services, search, information retrieval and data visualization applications.

This book constitutes the thoroughly refereed proceedings of the 12th International Conference on Metadata and Semantic Research, MTSR 2018, held in Limassol, Cyprus, on October 23-26, 2018. The 19 full and 16 short papers presented were carefully reviewed and selected from 77 submissions. The papers are organized in topical sections on metadata, linked data, semantics, ontologies and SKOS; digital libraries, information retrieval, big, linked, social and open data; cultural collections and applications; Knowledge IT Artifacts (KITA) in professional communities and aggregations; Digital Humanities and Digital Curation (DHC); European and national projects; agriculture, food and environment; open repositories, research information systems and data infrastructures.