Awareness of mission environment and events is impeded by data heterogeneity and lack of integration among data sources across diverse domains. In this paper, we present C3O, an RDF/OWL-based cyber ontology which provides a representation of cyber assets and events, to which existing XML-based cyber models (STIX, CybOX) can be mapped. C3O is unique in that it is designed as an extension of Basic Formal Ontology (BFO) and the Common Core Ontologies (CCO), which renders it automatically interoperable with a host of existing BFO- and CCO-based domain ontologies for land, sea, air, planning, operations, and sensor data.
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