<?xml version="1.0" encoding="utf-8"?>
<form>
    <fieldset name="general" addfieldpath="administrator/components/com_rstbox/models/forms/fields">
        <field name="operator" type="comparator"/>
        <field name="value" type="boxes"
            label="NR_SELECTION"
            description="NR_ENGAGEBOX_SELECT_BOX"
            multiple="true"
            excludeeditingbox="true"
            class="hasChosen"
        />
    </fieldset>
</form>