Method removeGroup

/**
 * Method to remove a group from the form definition.
 *
 * @param   string  $group  The dot-separated form group path for the group to remove.
 *
 * @return  boolean  True on success.
 *
 * @since   1.7.0
 * @throws  \UnexpectedValueException
 */
public function removeGroup($group)
{
    // Make sure there is a valid Form XML document.
    if (!$this->xml instanceof \SimpleXMLElement) {
        throw new \UnexpectedValueException(sprintf('%s::%s `xml` is not an instance of SimpleXMLElement', \get_class($this), __METHOD__));
    }
    // Get the fields elements for a given group.
    $elements =& $this->findGroup($group);
    foreach ($elements as &$element) {
        $dom = dom_import_simplexml($element);
        $dom->parentNode->removeChild($dom);
    }
    return true;
}