The key used to obtain the default variation axis value from a variation axis dictionary. The value obtained with this key is a CFNumberRef that specifies the default value of the variation axis.
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)