**input xml:**

```
<ce:author-group xmlns:ce="http://tempuri.org/ce" xmlns:sa="http://tempuri.org/sa">
  <ce:author>
    <ce:given-name>Rafael</ce:given-name>
    <ce:surname>Torres</ce:surname>
    <orfid>a</orfid>
    <ce:e-address type="email">rtorres@sissa.it</ce:e-address>
  </ce:author>
  <ce:affiliation>
    <ce:label>a</ce:label>
    <sa:organization>Scuola Internazionale Superiori di Studi Avanzati, Via Bonomea 265, I-34136, Triest</sa:organization>
    <sa:country>Italy</sa:country>
  </ce:affiliation>
</ce:author-group>

```

**desired output xml:**

```
<ce:author-group xmlns:ce="http://tempuri.org/ce" xmlns:sa="http://tempuri.org/sa">
  <ce:affiliation>
    <ce:label>a</ce:label>
    <sa:organization>Scuola Internazionale Superiori di Studi Avanzati, Via Bonomea 265, I-34136, Trieste</sa:organization>
    <sa:country>Italy</sa:country>
  </ce:affiliation>
</ce:author-group>

```

how to use single `<xsl:copy-of select="...">` in xslt to get output xml?

I don't want the `author` information, I only want to get `affiliation` information.