[xml] Original string content of node

[chris tech swing be]

Hi everybody,
 
How can I get the original string content of a node, I mean what appears in the file between the opening and the closing tag of this node ?

For example :
    ...
    <ROOT>
        <CHILD>text<TAG>text</TAG>text</CHILD>
    </ROOT>
I'd like to get the original string content of the node CHILD, namely
    text<TAG>text</TAG>text
 
Thanx
Christophe Bourez