15. The system according to claim 14 , further comprising: a machine-learning unit coupled to said token analysis module; said token analysis module to retrieve said set of statistical parameters corresponding to said each retrieved keyword and to assemble a vector containing said set of statistical parameters for said each retrieved keyword; said machine-learning unit to calculate said output value for said each retrieved keyword based on said vector, said output value indicating a probability that a corresponding retrieved keyword is selected as said dominant keyword.
14. The system according to claim 10 , wherein said token analysis module further selects said dominant keyword based on a highest-ranked output value calculated for said each retrieved keyword and retrieves said at least one category associated with said dominant keyword from said keyword database.