Sorting XML Nodes

Hey there,

I need to sort the XML tree based on one of its' nodes.
Let's say I have the following XML tree:

<root>
<item id=1/>
<item id=2/>
<item id=3/>
<item id=10/>
<item id=11/>
</root>

I've read that freemarker's sort_by built-in is pretty limited, i.e. you
cannot force the conversion of the sortable to number, for example (so you
can't do ?sort_by(["var1", "var2?number"])).
Now, when I do ?sort_by(["item","id"]), the result I get is this, of course:

<root>
<item id=1/>
<item id=10/>
<item id=11/>
<item id=2/>
<item id=3/>
</root>

My question is this - how can I emulate the natural sort order of the list,
by modifying id variables in the original XML?
I have full control of the original XML and can modify any values (add
string/digits, etc)?

Any ideas?

Thanks much,
Kirill

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