Removing attributes in a generic way ...

Hello,
I'm trying to remove some attributes in a generic way. see example below. I 
need to remove all last_name attributes regardless of the node.
Is there a generic way .

Thanks in advance.


Original document
<root>
  <person first_name="Dave" last_name="Rowe">
     <person first_name="Sandra" last_name="Smith" />
  </person>
  <person first_name="Patrick" last_name="Sullivan" />
</root>


Expected output
<root>
  <person first_name="Dave">
     <person first_name="Sandra" />
  </person>
  <person first_name="Patrick" />
</root> 

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