sorting on elementnames

Hello

A rather simple question: how can I sort on element names?

All sorting examples I've found sort on attribute values or element values,
but not on element names. 
For example, I have

<something>
   <a>
   <b>
   <b>
   <a>
   <b>
</something>

and I want to get 

<something>
   <a>
   <a>
   <b>
   <b>
   <b>
</something>

Thanks very much for help!

Regards,
Marcel

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