Grouping the elements

Hi,

I have the following xml for my input..

<?xml version="1.0" encoding="UTF-8"?>
<Root>
    <year>2006</year>
    <year>2007</year>
    <year>2008</year>
    <week>1</week>
    <day>01</day>
    <day>02</day>
</Root>


My expected output is 

<Root>
    <yearList>
        <year>2006</year>
         <year>2007</year>
        <year>2008</year>
     <yearList>
    <week>1</week>
    <dayList>
         <day>01</day>
         <day>02</day>
     </dayList>
</Root>


I want to group the element using xslt 1.0 and here element name is not fixed..it will be varied. when we have the same element then we need a parent element which have the element's name with List (i.e., yearList)

Is it possible to grouping in xslt1.0?

regards,
raj