typedef struct a_validate_db {
    unsigned short      version;
    const char *        connectparms;
    p_name              tables;
    MSG_CALLBACK        errorrtn;
    MSG_CALLBACK        msgrtn;
    MSG_CALLBACK        statusrtn;
    a_bit_field         quiet : 1;
    a_bit_field         index : 1;
    a_validate_type     type;
} a_validate_db;