1. A method comprising: segmenting each of a plurality of documents based on metadata associated with the plurality of documents to yield respective segments; forming a time series for each one of the plurality of documents based, at least in part, on the respective segments, the time series comprising a plurality of overlapping time lines, wherein each time line represents at least one period of time associated with a characteristic exhibited by a respective document from the plurality of documents; generating a multidimensional vector based on the time series, wherein each dimension in the multidimensional vector represents metadata associated with the plurality of documents; finding a pattern based, at least in part, on the multidimensional vector; and classifying each of the plurality of documents based, at least in part, on the pattern.