<option type="enum" id="opt/foo2xxx-Halftone">
    <!-- A multilingual <comments> block can appear here, too;
       it should be treated as documentation for the user. -->
    <arg_longname> <en>Halftone Algorithm</en> </arg_longname>
    <arg_shortname> <en>halftone</en> </arg_shortname>
    <arg_execution>
        <arg_group>Adjustment</arg_group>
	<arg_order>110</arg_order>
	<arg_spot>A</arg_spot>
	<arg_required />
	<arg_substitution />
	<arg_proto> %s </arg_proto>
    </arg_execution>
    <constraints>
	<constraint sense="true">
	    <driver>foo2zjs</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2zjs-z1</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2zjs-z2</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2zjs-z3</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
<!--
	Doesn't have -t option
	<constraint sense="true">
	    <driver>foo2oak</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2oak-z1</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
-->
	<constraint sense="true">
	    <driver>foo2hp</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2xqx</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2lava</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2qpdl</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2slx</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2hiperc</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2hiperc-z1</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
	<constraint sense="true">
	    <driver>foo2hbpl2</driver>
	    <arg_defval>ev/foo2xxx-Halftone-Default</arg_defval>
	</constraint>
    </constraints>
    <enum_vals>
	<enum_val id="ev/foo2xxx-Halftone-Default">
	    <ev_longname> <en>Default</en> </ev_longname>
	    <ev_shortname> <en>default</en> </ev_shortname>
	    <ev_driverval></ev_driverval>
	</enum_val>
	<enum_val id="ev/foo2xxx-Halftone-Standard">
	    <ev_longname> <en>Standard</en> </ev_longname>
	    <ev_shortname> <en>standard</en> </ev_shortname>
	    <ev_driverval>-q1 </ev_driverval>
	</enum_val>
	<enum_val id="ev/foo2xxx-Halftone-as">
	    <ev_longname> <en>Accurate Screens (better)</en> </ev_longname>
	    <ev_shortname> <en>as</en> </ev_shortname>
	    <ev_driverval>-qas </ev_driverval>
	</enum_val>
	<enum_val id="ev/foo2xxx-Halftone-wts">
	    <ev_longname> <en>Well Tempered Screens (best)</en> </ev_longname>
	    <ev_shortname> <en>wts</en> </ev_shortname>
	    <ev_driverval>-qwts </ev_driverval>
	</enum_val>
    </enum_vals>
</option>
