| b10 | b16 | field | type | size | bitfield | comments |
| 0 | 0 | xstUsrInitl | XCHAR[10] | pascal-style string holding initials of annotation author | ||
| 20 | 14 | ibst | short | index into GrpXstAtnOwners | ||
| 22 | 16 | ak | short | :2 | 0003 | unused |
| short | :14 | FFFC | unused | |||
| 24 | 18 | grfbmc | uns short | unused | ||
| 26 | 1A | lTagBkmk | long | when not –1, this tag identifies the annotation bookmark that locates the range of CPs in the main document which this annotation references. |