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As our cyber society develops and expands, the importance of cybersecurity operations is growing in response to cybersecurity threats coming from beyond national borders. Efficient cybersecurity operations require information exchanges that go beyond organizational borders. Various industry specifications defining information schemata for such exchanges are thus emerging. These specifications, however, define their own schemata since their objectives and the types of information they deal with differ, and desirable schemata differ depending on the purposes. They need to be organized and orchestrated so that individual organizations can fully exchange information and collaborate with one another. To establish the foundations of such orchestration and facilitate information exchanges, this paper proposes a reference ontology for cybersecurity operational information. The ontology structures cybersecurity …