The ICCTAG_BASE structure is used to save the basic part of each tag type.
A value that indicates the signature of the tag type.
Pointer to an array of 4 reserved bytes. Must be set to 0.
The Signature value can be one of the values in the list ICCTAGTYPESIGNATURE or it can be a private tag. The registration authority for these data is the ICC Technical Secretary. For contact information, refer to the ICC web site (http://www.color.org/index.xalter).