element to root

Hi all,

I am still struggling with coming up with an xsl
transform that will convert this source:

------
<p>
  <span style="style a">
    span a text 1
    <span style="style b">
      span b pre br text
      <br name="b"/>
      span b post br text
    </span>
    span a text 2
  </span>
</p>
------

TO:

------
<p>
  <span style="style a">
    span a text 1
    <span style="style b">
      span b pre br text

      <br name="b"/>
      span b post br text
    </span>
    span a text 2
  </span>
</p>
------


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