Datasets Activity Stream About Pages Order by Relevance Name Ascending Name Descending Last Modified Go 1 dataset found Catalogs: DERI Vocabularies Formats: CSV Filter Results orca, the Ontology of Reasoning, Certainty and Attribution orca, the Ontology of Reasoning, Certainty and Attribution, is an ontology for characterizing the certainty of information, how it is known, and its source TTL RDF CSV