XML In salesforce Apex

DOM(Document object model) :

DOM namespace contains classes using which we can parse or generate XML content. DOM anme space contains following classes.
    1. Document
    2. XM Node

Document:
          This is a predefined class defined in the DOM name space using which we can process body of an XML document.

Syntax :

DOM.document xmldoc = new DOM.document();

Methods in Document class :

1. createRootElement(name, namespace, prefix)
2. getRootElement()
3.load(xml)
4.toXmlString()

1. createRootElement(name, namespace, prefix) : creates the top-level root element for a document.
signature :
public Dom.XmlNode createRootElement(String name, String namespace, String prefix)