// Example 1: Get the node name of a QDomElement QDomElement element = document.firstChildElement("root"); QString elementName = element.nodeName(); // Example 2: Get the node name of a QDomText QDomText text = element.firstChild().toText(); QString textName = text.nodeName(); // Example 3: Get the node name of a QDomComment QDomComment comment = element.firstChild().toComment(); QString commentName = comment.nodeName();In Example 1, we get the first child element of the document and store its nodeName in a QString. In Example 2, we get the first child text node of the root element and store its nodeName in a QString. And in Example 3, we get the first child comment node of the root element and store its nodeName in a QString. Overall, the QDomNode class and its properties and methods are part of the Qt Core library's Qt XML module.