14. The non-transitory machine-readable medium of claim 9 , including receiving a query and identifying a document relevant to the query based, at least in part, on the ontology.
17. The non-transitory machine-readable medium of claim 14 , including receiving a query and identifying a document relevant to query based on an ontology data element value, a semantic link, and a metadata annotation, and including selectively progressively relaxing the query over one or more ontology data elements.