Method setFields

/**
 * Method to set some field XML elements to the form definition.  If the replace flag is set then
 * the fields will be set whether they already exists or not.  If it isn't set, then the fields
 * will not be replaced if they already exist.
 *
 * @param   array    &$elements  The array of XML element object representations of the form fields.
 * @param   string   $group      The optional dot-separated form group path on which to set the fields.
 * @param   boolean  $replace    True to replace existing fields if they already exist.
 * @param   string   $fieldset   The name of the fieldset we are adding the field to.
 *
 * @return  boolean  True on success.
 *
 * @since   1.7.0
 * @throws  \UnexpectedValueException
 */
public function setFields(&$elements, $group = null, $replace = true, $fieldset = 'default')
{
    // Make sure there is a valid Form XML document.
    if (!$this->xml instanceof \SimpleXMLElement) {
        throw new \UnexpectedValueException(sprintf('%s::%s `xml` is not an instance of SimpleXMLElement', \get_class($this), __METHOD__));
    }
    // Make sure the elements to set are valid.
    foreach ($elements as $element) {
        if (!$element instanceof \SimpleXMLElement) {
            throw new \UnexpectedValueException(sprintf('%s::%s `xml` is not an instance of SimpleXMLElement', \get_class($this), __METHOD__));
        }
    }
    // Set the fields.
    $return = true;
    foreach ($elements as $element) {
        if (!$this->setField($element, $group, $replace, $fieldset)) {
            $return = false;
        }
    }
    // Synchronize any paths found in the load.
    $this->syncPaths();
    return $return;
}