ApiPlatform\Core\Bridge\Symfony\Routing\ApiLoader::loadExternalFiles PHP Method

    private function loadExternalFiles(RouteCollection $routeCollection)
    {
        $routeCollection->addCollection($this->fileLoader->load('api.xml'));
        if (isset($this->formats['jsonld'])) {
            $routeCollection->addCollection($this->fileLoader->load('jsonld.xml'));
        }
    }