How to get the root tag name

I have a problem: I receive several XML files in my transaction input
<?xml version="1.0" encoding="UTF-8"?>
<NAMES>
</NAMES>
<?xml version="1.0" encoding="UTF-8"?>
<VALUES>
</VALUES>
and I want to obtain the root tag name (the string NAMES, VALUES, ecc.).
I obtained this result using a XSL transformation, bui I think that the best (and easiest) way is to use an XPath command. I tried but I can not find the right command.
Does anybody know how to do this?

I found it:
Transaction.Source{name(/*)}

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How to get the root tag name

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