InvalidXmlException example

$schemaSource = file_get_contents((string) $schemaOrCallable);
                $valid = @$dom->schemaValidateSource($schemaSource);
            } else {
                libxml_use_internal_errors($internalErrors);

                throw new XmlParsingException(sprintf('Invalid XSD file: "%s".', $schemaOrCallable));
            }

            if (!$valid) {
                $messages = static::getXmlErrors($internalErrors);
                if (!$messages) {
                    throw new InvalidXmlException('The XML is not valid.', 0, $e);
                }
                throw new XmlParsingException(implode("\n", $messages), 0, $e);
            }
        }

        libxml_clear_errors();
        libxml_use_internal_errors($internalErrors);

        return $dom;
    }