Detecting and tracking new events/classes of documents in a data base

Detecting and tracking of new events/classes of documents are disclosed. A method for detecting new events and/or classes of documents and tracking evolution thereof in a database, said new events and/or classes of said documents being added to said database, said documents including attribute data related to a temporal parameter, said method includes the steps of providing vectors of said documents related to attribute data including said temporal parameter included therein, and detecting said new events and classes and tracking the evolution thereof using said vectors.