If the target entity could not be located in the schema this property returns false. The target entity is specified via the GetConstraintsOnXsdValue method of the XsdValueSetConstraint class.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2