gnome-control-center/capplets/screensaver/screensavers/epicycle.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="epicycle">

    <command arg="-root"/>

    <number _label="Speed of Motion." _low-label="Faster" id="delay"
            type="slider" default="2" arg="-delay %" low="1"
            _high-label="Slower" high="500000"/>

    <number _label="Time finished product is shown."
            _low-label="Seconds" id="holdtime" type="spinbutton"
            default="3" arg="-holdtime %" low="1" high="15"/>

    <boolean _label="Display screensaver in monochrome." arg-unset=""
             id="monochrome" test="mono" arg-set="-mono"/>

</screensaver>