/** Provides classes storing and allowing the fast retrieving of several types of information using a MySQL database or the content of an xml file and a directory.

This package contains two classes : MySQLbase and MediaBase. These classes are used to store and retrieve information, and, therefore, can also provide an "exchange area" for other object to communicate. MySQLbase plays such a role : it saves calculus results to avoid submitting them twice but allows also an object to write them and another to read them, thus serving as a buffer between the two.

*/