public string SubVersionNumber { get; }

Public ReadOnly Property SubVersionNumber As String
	Get

public:
property String^ SubVersionNumber {
	String^ get ();
}

SubVersionNumber of Revit may have additional APIs and functionality not available in the standard customer releases. Add-ins written to support standard Revit releases should be compatible with SubVersionNumber releases, but add-ins written specifically targeting new features in SubVersionNumber releases would not be compatible with the standard releases.