PK_ERROR_code_t      PK_ATTRIB_ask_nth_axis
(
--- received arguments ---
PK_ATTRIB_t          attrib,        --- attribute
int                  field_no,      --- field number (>= 0)
int                  index,         --- index of axis (>= 0)

--- returned arguments ---
PK_AXIS1_sf_t *const axis           --- nth axis
)


This function returns a single element of the axis array from field
field_no of the given attribute.


Specific Errors:
    PK_ERROR_bad_field_number       The attribute does not have a field with
                                    this number
    PK_ERROR_field_of_wrong_type    The field is not an axis field
    PK_ERROR_bad_index              The field has no axis with this index