The Bob structure is defined in the include file <graphics/gels.h> as
follows:

struct Bob
  {
  WORD               Flags;     /* general purpose flags                 */
  WORD              *SaveBuffer;/* buffer for background save            */
  WORD              *ImageShadow; /* shadow mask of image                */
  struct Bob        *Before;   /* draw this Bob before Bobs on this list */
  struct Bob        *After;     /* draw this Bob after Bobs on this list */
  struct VSprite    *BobVSprite;/* this Bob's VSprite definition         */
  struct AnimComp   *BobComp;   /* pointer to this Bob's AnimComp def    */
  struct DBufPacket *DBuffer;   /* pointer to this Bob's dBuf packet     */
  BUserStuff         BUserExt;  /* Bob user extension                    */
  };

The Bob structure itself does not need to be in Chip memory. The (global)
static declaration of a Bob structure could be done like so:

    struct Bob myBob =
        {
        0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 0
        };

However, since most of the Bob structure members are pointers, it is more
common to allocate and set the Bob up dynamically. Refer to the makebob()
and freebob() functions in the "animtools.c" example at the end of the
chapter for an example of allocating, initializing and freeing a Bob
structure.

 linking bob and vsprite structures