path command to libary

Hello, It has been a while that i was working on my app, a lot of other things to do. I am prepering a package to install my app. I think it is wise to put the app in the application folder and the database in the llbary folder. Is there a command that I can use to get the libary folder. I use Path(), Respath() and Userpath(), but I could not find a LibaryPath(). Is there one available.