/* profileClass enumerations */
 typedef enum {
     icSigInputClass              = 0x73636E72L,    /* 'scnr' */
     icSigDisplayClass            = 0x6D6E7472L,    /* 'mntr' */
     icSigOutputClass             = 0x70727472L,    /* 'prtr' */
     icSigLinkClass               = 0x6C696E6BL,    /* 'link' */
     icSigAbstractClass           = 0x61627374L,    /* 'abst' */
     icSigColorSpaceClass         = 0x73706163L,    /* 'spac' */
     icSigNamedColorClass         = 0x6E6D636CL,    /* 'nmcl' */
     icMaxEnumClass               = 0xFFFFFFFFL     /* enum = 4 bytes max */
 } icProfileClassSignature;