How to display xml sting as tree , using af:tree

Hi, i need to display a xml string stored in the data base table, as a xml tree in GUI.
I understand ADF having a component called <af:tree> . It expects input data as "oracle.adf.view.faces.model.TreeModel" type.
how to convert the string format of xml stored in the database , to the required type " "oracle.adf.view.faces.model.TreeModel"".
Is there any examples to do this. Thanks .
ganesh

Thanks for the post.
I looked at the link , before posting my question. That;s not i what i want. It says,
The Oracle ADF Framework includes a Data Control for URL Services (a.k.a URL Service Data Control). The URL Service Data Control provides the ability to access files (CSV, XML) through a URL. You can also utilize this Data Control to access Servlets and JSPs that return simple, textual data such as XML data. In this How To, the URL Service Data Control will be used to access the JDeveloper RSS News feed and present that data within a Rich Client Interface. You will need JDeveloper 11g, available from OTN, to give this a try. Also provided is the Application that is utilized in this How-To.
But what i want is entirely different than URL data control.
A table is having xml file as string (The size can go upto 1 mb. )
In the GUI i need to display it as tree.

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