XmlNode node = someFunctionToGetNode(); if(node.IsNull()){ cout << "Node is null." << endl; } else{ cout << "Node is not null." << endl; }This code creates an XmlNode object "node" and checks whether it is null or not by calling the IsNull method. If the node is null, it prints "Node is null." to the console; otherwise, it prints "Node is not null.". Package/library: XmlNode is a part of the Microsoft XML Core Services (MSXML) library, which is a proprietary library for manipulating XML in Windows environments.