1. A computer-implemented method for determining query return referent data for concept types in a conceptual graph comprising: generating a conceptual graph for a document query, the conceptual graph comprising a plurality of graph terms; identifying one of more of the plurality of graph terms needing referent data; identifying conceptually similar terms for each of the graph terms; for the graph terms needing referents, identifying referent data by searching for instances where conceptually similar terms for graph terms needing referent data are associated by conceptually similar terms for the linking concept term; and associating identified referent data with the graph terms needing referent data.