1. A method for identifying and characterizing an analogy in a document, the method comprising: identifying a candidate document, wherein the candidate document comprises an analogy for a target concept, a region of interest, and a linguistic marker included in the region of interest; classifying the candidate document as an analogy document or a non-analogy document based upon a size of the region of interest and a count of the linguistic marker; identifying a source concept from the analogy document, wherein the source concept comprises the analogy; and characterizing the source concept with corresponding metadata, wherein the metadata comprises a familiarity of the source concept, a length of the source concept, and a readability of the source concept.