The key for an affine matrix. The associated value is an NSArray object ([a b c d tx ty]) that defines the transformation to apply to the sampler.
Available in Mac OS X v10.4 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)