Taking a snapshot of the screen using Applescript?

Is there any way of taking a snapshot of the screen using Applescript?

Browser: Safari 412
Operating System: Mac OS X (10.4)

set tmpPath to ((POSIX path of (path to desktop)) & "screenshot.pdf") as string
do shell script "screencapture " & quoted form of tmpPath

Fire up terminal and type “screencapture” to get all of the available options for the command.
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