could anybody tell me what's the difference of these 2 paths?

[swaywood]

could anybody tell me what's the difference of database.filename and document.name?

if then, please tell me when or where they will get the different path.

[mzakiralam]

you might get your answer in the below link. Please try it out.
http://through-the-interface.typepad.com/through_the_interface/2008/03/getting-the-ful.html