basic xpath question

Hi,

 I have an xml document to be styled, if I have a construct such as 

<section id="para">this is text <section id="url"
url="http://xx.yy.zz">which is to be a link</section></section>

How do I, in xslt, recognise the "url" tag within the "para" tag, such that
I could ouput someting like

<p>this is test <a href="http://xx.yy.zz">which is to be a link</a></p>

Regards




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