public function getNodeElements($field_name)
	{
		$node_elements = $this->findAll(
			'named',
			array('field', $this->getXpathEscaper()->escapeLiteral($field_name))
		);

		if ( empty($node_elements) ) {
			throw new FormException(
				sprintf('Form field "%s" not found', $field_name),
				FormException::TYPE_NOT_FOUND
			);
		}

		return $node_elements;
	}