In OS X 10.9 Mavericks, you can view the com.apple.iTunes.sdef
file at /System/Library/Frameworks/Foundation.framework/Versions/Current/Resources
. This lists the scripting target access group associated with each AppleScript command.
There are six access groups:
com.apple.iTunes.device
com.apple.iTunes.library.read
com.apple.iTunes.library.read-write
com.apple.iTunes.playback
com.apple.iTunes.podcast
com.apple.iTunes.user-interface