The key for the composition origin. The associated value is an NSNumber object that contains a Boolean value. YES indicates the composition is built-in (provided by Mac OS X).
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)