gvSIG Map Sheets is a conventional extension for gvSIG. You can see here a basic introduction to its functionality. It adds most of its functionality by extending existing classes in the gvSIG core (inheritance). Essentially it deals with:

• In-memory vector layers.
• Fast refreshment of the application canvas (MapControl).
• A special type of map (layout).
• Automatic printing of several maps.
• XML-based persistence.
• Basic reading/writing of shapefiles.