Matchin elements in text nodes

My xml file looks like this:

...
<article>
First part of article
bla bla bla
  <sub_header>this is the sub header</subheader>
Second part
bla bla bla
</article>
...

I tried several ways to write a stylesheet that produces me a html output like
this:

...
<p>
First part of article
bla bla bla
  <b>this is the sub header</b>
Second part
bla bla bla
</p>
...

I am confused how to handle elements that are between text. I tried different
ways using the text() operator.

Maybe somebody can help me?

Thanks in advance

Mika



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