12. The method of claim 1 , further comprising: receiving a query; and retrieving information from the second ontology based on the query, the retrieving comprising combining contributions of pertinence, with respect to the query, from the machine-learned new features and the symbolic knowledge.
13. The method of claim 12 , wherein the query includes a balancing factor, and the combining comprises adjusting the contributions from the machine-learned new features and the symbolic knowledge based on the balancing factor.