14. The system of claim 8 , wherein the analogy is an explanatory analogy.
8. A system for identifying and characterizing an analogy in a document, the system comprising: a memory; and a processor coupled to the memory, wherein the processor is capable of executing instructions to perform steps of: 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, and wherein the familiarity of the source concept is calculated using an extracting Distributional related words using Co-occurrences (DISCO) tool, the length of the source concept is calculated using the size of the region of interest, and the readability of the source concept is calculated using a Flesch-Kincaid readability score method.