#includeIn this example, we create a new QDomDocument object and a root QDomElement object. We add an attribute to the root element using setAttribute() method. Finally, we call hasAttribute() method to check if the root element has the version attribute. The package library for QDomElement is Qt, which is a cross-platform application development framework.#include #include int main() { // Create a new QDomDocument object QDomDocument doc("mydocument"); // Create a new QDomElement object QDomElement root = doc.createElement("root"); // Add an attribute to the root element root.setAttribute("version", "1.0"); // Check if the root element has the version attribute if (root.hasAttribute("version")) { qDebug() << "The root element has the version attribute"; } else { qDebug() << "The root element does not have the version attribute"; } return 0; }