struct PK_ATTDEF_register_cb_o_s
    {
    int                       o_t_version;
                                       --- version number of option structure
    PK_ATTDEF_callback_type_t callback_type;   --- normal or read_only
    };

typedef struct PK_ATTDEF_register_cb_o_s
               PK_ATTDEF_register_cb_o_t;



Holds optional controls for registering a callback


The option structure defines options applicable to registering an attribute
callback.

Description of fields:

callback_type          Type of callback function. Permitted values are:
                              PK_ATTDEF_callback_normal_c (the default)
                              PK_ATTDEF_callback_read_only_c