graphical mapping issue

Hi guys

we need a little help to solve this requirement below;

Input xml file

<Root>     <Header>        <H1>headerdata</H1>    </Header>    <Item>        <I1>itemdata1</I1>    </Item>    <Item>        <I2>itemdata2</I2>    </Item>    <Item>        <I3>itemdata3</I3>    </Item></Root>

needed output file is;

<Root>     <Data1>        <header>headerdata</header>        <item>itemdata1</item>    </Data1>    <Data2>        <header>headerdata</header>        <item>itemdata2</item>    </Data2>    <Data3>        <header>headerdata</header>        <item>itemdata3</item>    </Data3></Root>

can anyone assist me? Thank you