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The node element with @id=1 is copied and subsequently assigned a new QName using the rename expression. Note that the transform expression is the only expression which returns an actual XDM instance as a result. You can therefor use it to modify results and especially DOM nodes. This is an issue beginners are often confronted with. More on this topic can be found in the [[Update#Returning Results|XQUF Concepts]] section.
The following example hopefully clears things up a bit.:
<pre class="brush:xquery">
)
return $c
</pre>
Result:
<pre class="brush:xquery">
<entry>
<id>1</id>
<title>How to use a transform expression</title>
<updated>2011-02-23</updated>
<author>
<name>BaseX</name>
<uri>http://basex.org</uri>
<member>Joey</member>
</author>
<content type="html">Copy of: Transform expression example created by BaseX Team</content>
</entry>
</pre>
