IPhoto'11 - v9.6.2 - cannot find a description of db schema

Question

In a Ruby script I access the iPhoto database, I get a root_folder uuid from the RKFolder in the Library.apdb :
@root_folder_uuid = @db.execute("SELECT uuid FROM RKFolder table WHERE name = '#{@config["root_folder"]}' AND parentFolderUuid = 'TopLevelAlbums' ").flatten.first
then using this root uuid , I get get all albums uuid within the root folder, from the RKAlbum in the Library.apdb :
albums = @db.execute("SELECT uuid, name FROM RKAlbum table WHERE folderUuid = '#{@root_folder_uuid}' AND albumSubclass = 3 ")
Now , I need to get all photos within each album... when i look at the RKMaster table (where all photos records are stored) .. I don't see what is the relationship attribute between a photo record and an album....
any hints ? thanks for help

Answer 1

No the export functionality is not helpful for me... my script intend to extend what the app 'iPhoto to disk'  ( http://www.iphototodisk.com/ ) 
- get a list of albums and pictures in albums   (   'iPhoto to disk'  export the result on disk in a tree folder hierarchy ) it does it very well ( so I guess they did a reverse engineering .of the iPhotoLibrary)
BUT
in the same script , I want to sync the list and files with an AWS S3 bucket (used by one of my ruby web apps)
I can use 'iPhoto to disk' then export the files and folders to AWS S3..in a 2 steps process but it's an erase and copy over taks in this case , not a synchro
I could live with it , not my customer ...
Whatever , Photos is now coming out... so i'll wait and expect a better support from Apple on accessing Apple apps data....