/* Standard Observer, used in the measurementType tag */
 typedef enum {
     icStdObsUnknown							= 0x00000000L,				/* Unknown observer */
     icStdObs1931TwoDegrees		= 0x00000001L,									/* 1931 two degrees */
     icStdObs1964TenDegrees		= 0x00000002L,									/* 1961 ten degrees */
     icMaxStdObs							= 0xFFFFFFFFL	/* enum = 4 bytes max */
 } icStandardObserver;