-** \brief Used for importing bitmaps of various formats, including animations
-** \todo Write more detailed description
+** \brief Used for importing bitmaps of various formats, including animations.
+*
+* It is the base class for all the importers. It defines the has a static Book
+* pointer class that is a map for the importers factory creators and the strings
+* of the extension that the importer can understand. It allows to create the a
+* pointer to a particular importer just by using the extension of the name of file
+* to import. Also it creates a virtual member get_frame that must be declared in
+* the inherited classes.
+* \see module.h
+** \