OM 2020-15th ISWC workshop on ontology matching Pavel Shvaiko; Trentino Digitale; Italy; Jérôme Euzenat; INRIA & University Grenoble Alpes; France; Ernesto Jiménez-Ruiz; City; Univeristy of London; UK & SIRIUS; Univeristy of Oslo; Norway; Oktie Hassanzadeh; IBM Research; USA; Cássia Trojahn; IRIT; France. OM 2020-15th ISWC workshop on ontology matching, Nov 2020, Athens (virtual), Greece. 2788, CEUR.org, pp.1-253, 2020, OM 2020, ISSN 1613-0073