Storing information with a description logic file system

Methods, systems, and products for storing information in a data processing system. The method includes providing a knowledge base for a file system manager that is adapted to organize a plurality of real files on a mass memory of the data processing system. The knowledge base defines a collection of knowledge that includes a set of concepts, a set of relations among the concepts, and a set of relations of inclusion that describe each real file as an instance of at least one concept. The method includes detecting a command for the file system manager for accessing a set of selected instances. The method also includes identifying a set of selected real files, which are described by the selected instances (according to the knowledge), and accessing the selected real files on the mass memory.