An 1.1 compliant frontend should:
1) check for sane version >= 1.1 (a macro will be provided)
2) call sane_control_option
int supported_version = SOMEMACRO(1,1);
sane_control_option(handle, 0, SANE_ACTION_XXXX, &supported_version,
NULL);
3) the backend can then expose sane 1.1 features.
I can check every backend driver to see if they can handle
a previously unknown SANE_ACTION_XXX and eventually fix them.
A frontend that declares itself 1.1 capable should be able
to handle unknown frame formats and, generally, be able
to correctly use the default: label of any switch statement
to handle an unknown condition.
Especially when dealing with enums, it is a good practice
to not assume that an enum will always have a fixed amount
of entries.
--
Best regards,
Alessandro Zummo,
Tower Technologies - Torino, Italy
http://www.towertech.it
