how to group same type nodes together?

Hi,

If I have a xml file:

<parent>
    <child1>child1</child1>
    <child2>child2</child2>
    <child3>child3</child3>
    <child2>child2</child2>
    <child1>child1</child1>
</parent>

I want to turn it into:

<parent>
    <child1>child1</child1>
    <child2>child2</child2>
    <child2>child2</child2>
    <child3>child3</child3>
    <child1>child1</child1>
</parent>

How can I do it?

regards,

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