12. The computer-readable medium of claim 11 , the operations further comprising building the ontology based at least in part on the observed actions and further based at least in part on explicit user feedback, including a rating submitted by the user of the client machine, the rating associated with user perception of a relevance of the results of the query.
12. The computer-readable medium of claim 11 , the operations further comprising building the ontology based at least in part on the observed actions and further based at least in part on explicit user feedback, including a rating submitted by the user of the client machine, the rating associated with user perception of a relevance of the results of the query. 13. The computer-readable medium of claim 12 , the operations further comprising determining the query context by learning semantic relationships between keywords in the query.