Is used for attributes whose attribute definition was deleted from the schema.
#define SYN_UNKNOWN 0
Unknown
2.16.840.1.113719.1.1.5.1.0
typedef struct { pnstr8 attrName; nuint32 syntaxID; nuint32 valueLen; nptr value; } Unknown_Attr_T;
uint32 Length = N BYTE[N] Content
For help in understanding the syntax definition template, see Reading Syntax Definitions.