private static function updateFieldMeta(&$field, $values)
    {
        // Update Field Meta ItemType
        self::updateFieldStrVal($field, $values, "itemtype");
        // Update Field Meta ItemProp
        self::updateFieldStrVal($field, $values, "itemprop");
        // Update Field Meta Tag
        if (isset($values["itemprop"]) || isset($values["itemtype"])) {
            if (is_string($field->itemprop) && is_string($field->itemtype)) {
                $field->tag = md5($field->itemprop.IDSPLIT.$field->itemtype);
            }
        }
    }