| This query service returns all objects that have a specified level of certainty with respect to a particular predicate. The ontology associates the properties of each object with certainty information, including whether the object exists or does not exist (isExtant), this allows the system to represent the existence of objects with particular degress of confidence. The query engine can exploit this information to answer queries of the form: 'return all objects that believed to exist with a certainty level of 0.5'. |