How to generate XML in APEX

The Apex code to create an XML file is as follows:

public class XMLgen {
    public string xmlstring { get; set;}

    public XMLgen(){
        DOM.Document doc = new DOM.Document();

        dom.XmlNode products = doc.createRootElement('products', null, null);
        dom.XmlNode body1= products.addChildElement('product', null, null);

        body1.addChildElement('Name', null, null).addTextNode('Xbox One');
        body1.addChildElement('Code', null, null).addTextNode('XBO');

        dom.XmlNode body2= products.addChildElement('product', null, null);

        body2.addChildElement('Name', null, null).addTextNode('PlayStation 4');
        body2.addChildElement('Code', null, null).addTextNode('PS4');

        dom.XmlNode body3= products.addChildElement('product', null, null);

        body3.addChildElement('Name', null, null).addTextNode('WII');
        body3.addChildElement('Code', null, null).addTextNode('Wii');

        xmlstring = doc.toXmlString();
    }
}

We have used a class DOM.Document which is used to create XML files. Next we create a new root node which will be held by a variable called ‘products’. This will be used to create child nodes and attributes of the root node.
Next we will create child nodes, the value returned for these nodes could be held by the individual nodes if we want to create more sub nodes, like I have kept the value saved, so that text nodes could be added to these nodes.
For every addChildElement() function there are three values, the name of the node, the namespace add the prefix for the node. I have kept the last two values as null, you can add it according to your need.
Once it is done, the toXMLString() function returns the corresponding string of the XML file. Save it, and show it in a VF page, like I have done.

The output of the XML page will be like:

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