[xsl] save specific nodes from the tree and form a xml

Hi All,
Suppose orig.xml is as below,
<Root>
    <Parent>
         <Child1 Apply="1">
              <Value>100</Value>
         </Child1>
         <Node2>
               <Value>0</Value>
         </Node2>
     </Parent>
</Root>

I need to save only the nodes which has the flag "Apply=1" along with
the complete hierarchy in another xml file. And not its other
children.

-->new.xml would be as,
<Root>
    <Parent>
         <Child1 Apply="1">
              <Value>100</Value>
         </Child1>
     </Parent>
</Root>

I just used a simple example here. Actually the original xml file will be
a large file.

Please let me know, how the xslt has to be, to transform the orig.xml
to new.xml.

Thanks
Senthil