can't get text from class azf4

I cannot coherce text out of address book id ?
when i replace AB_id with a string it sets filemaker variable with no hitch
I’ve tried text and character manipulations with many variations with no success
such as > text 2 thru (the (length of AB_id) - 1) of AB_id
what is class azf4 ?

tell application "Address Book"
	get selection
	copy result to AB_id
end tell
tell application "FileMaker Pro Advanced"
	tell database "TWSLabor"
		tell table "Main"
			set cell "g_uuid" to text 2 thru (the (length of AB_id) - 1) of AB_id
		end tell
	end tell
end tell

Model: MacPro 2X2.66 GHz / 5GB
AppleScript: 2.1.1
Browser: Safari 531.21.10
Operating System: Mac OS X (10.6)


selection returns a list of persons, each person contains all elements and properties
To retrieve the id of one person you could do

tell application "Address Book"
	set AB_id to id of item 1 of (get selection)
end tell