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.
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. 14. The method of claim 12 , wherein the query comprises a document, and the retrieving comprises identifying a category for the document.