[xsl] Group nodes

[IZASKUN GUTIERREZ GUTIERREZ <igutierrez027@xxxxxxxxxxxxx>]

Hello everybody!

I have this XML :

<Book rdf:ID="boo">
  <address>Almogavers 56</address>
  <date>
    <Date>
        <month>January</month>
    </Date>
  </date>
  <date>
    <Date>
        <year>2006</year>
    </Date>
  </date>
</Book>

and I need group tags <month> and <year> like this:

<Book rdf:ID="boo">
  <address>Almogavers 56</address>
  <date>
    <Date>
        <month>January</month>
        <year>2006</year>
    </Date>
  </date>
</Book>

I need this result.

Anybody can help me?

Thank you, Regards

Izaskun