PK_ERROR_code_t       PK_ATTRIB_ask_axes
(
--- received arguments ---
PK_ATTRIB_t           attrib,       --- attribute
int                   field_no,     --- field number (>= 0)

--- returned arguments ---
int            *const n_axes,       --- number of axes (>=0)
PK_AXIS1_sf_t **const axes          --- axes (optional)
)


This function returns the array of axes 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


The output array axes is optional.  If it is set to NULL, then the function
will only return the number of axes in the field.