The media-type attribute for subfolders is left empty, such as that for the pictures folder, which is empty in my example, but normally contains the graphic source files for any embedded pictures.

For example, if you had a graphic called mygraphic.png, you could attach an attribute called "thumbnail" that contained a small version of the image.

The system can provide the drawing of basic graphic element, the connection with attribute database, and meet the basic need of the field management.