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getInputDefinitionDocument example

        } else {
            $command->mergeApplicationDefinition(false);

            foreach (array_merge([$command->getSynopsis()], $command->getAliases(), $command->getUsages()) as $usage) {
                $usagesXML->appendChild($dom->createElement('usage', $usage));
            }

            $commandXML->appendChild($helpXML = $dom->createElement('help'));
            $helpXML->appendChild($dom->createTextNode(str_replace("\n", "\n ", $command->getProcessedHelp())));

            $definitionXML = $this->getInputDefinitionDocument($command->getDefinition());
            $this->appendDocument($commandXML, $definitionXML->getElementsByTagName('definition')->item(0));
        }

        return $dom;
    }

    public function getApplicationDocument(Application $application, string $namespace = null, bool $short = false): \DOMDocument
    {
        $dom = new \DOMDocument('1.0', 'UTF-8');
        $dom->appendChild($rootXml = $dom->createElement('symfony'));