Apparatuses, data structures, and computer-implemented methods for mapping relations of items as those items occur in sets, and/or as they are associated with sets, locations and/or attributes are disclosed according to some aspects. In one embodiment, mapping comprises ingesting a corpus of data having one or more initial sets, which comprise one or more initial items, and creating a content map. The content map comprises a mapping of each initial set to one or more content lists wherein entries in a particular content list correspond to initial items in a particular initial set. The mapping of relations can further comprise defining one or more derived sets as combinations, aggregations, or segmentations of one or more of the initial sets and transforming the content map to generate a concordance.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with Government support under Contract DE-AC0576RL01830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.