Restructure via grouping

How can I do the following restructuring? Do I need to use grouping?

Inside and outside of my <doc> node there are <fragment> nodes. I want
to collect them all and place them insde a new <fragments> tag. 

So for this input:

<root>
        <doc>
                <fragment pos="1"/>
                <fragment pos="2"/>
                <fragment pos="3"/>
        </doc>
        <fragment pos="4"/>
        <fragment pos="5"/>
</root>

I would need the following output:
<root>
        <doc>
                <fragments>
                        <fragment pos="1"/>
                        <fragment pos="2"/>
                        <fragment pos="3"/>
                        <fragment pos="4"/>
                        <fragment pos="5"/>
                </fragments>            
        </doc>
</root>

I played around with generate-key() a little bit, but could not make it.
Can you help.

Thanks in advance.

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