Strip All Foreign-Namespace Nodes with XQuery - xquery

Question

Input document:
<entry xmlns="http://www.w3.org/2005/Atom">
<id>urn:uuid:1234</id>
<updated>2012-01-20T11:30:11-05:00</updated>
<published>2011-12-29T15:44:11-05:00</published>
<link href="?id=urn:uuid:1234" rel="edit" type="application/atom+xml"/>
<title>Title</title>
<category scheme="http://uri/categories" term="category"/>
<fake:fake xmlns:fake="http://fake/" attr="val"/>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<p>Blah</p>
</div>
</content>
</entry>
<!-- more entries -->
I want the output to be exactly the same, but with non-Atom elements like <fake:fake xmlns:fake="http://fake/" attr="val"/> stripped out. This is what I have, which doesn't work at all, just giving me the same input back:
declare namespace atom = "http://www.w3.org/2005/Atom";
<feed>
<title>All Posts</title>
{
for $e in collection('/db/entries')/atom:entry
return
if
(namespace-uri($e) = "http://www.w3.org/2005/Atom")
then
$e
else
''
}
</feed>
What am I doing wrong?

Answer 1

You can try the following query on try.zorba-xquery.com:
let $entry := <entry xmlns="http://www.w3.org/2005/Atom">
<id>urn:uuid:1234</id>
<updated>2012-01-20T11:30:11-05:00</updated>
<published>2011-12-29T15:44:11-05:00</published>
<link href="?id=urn:uuid:1234" rel="edit" type="application/atom+xml"/>
<title>Title</title>
<category scheme="http://uri/categories" term="category"/>
<fake:fake xmlns:fake="http://fake/" attr="val"/>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<p>Blah</p>
</div>
</content>
</entry>
return {
delete nodes $entry//*[not(namespace-uri(.) = "http://www.w3.org/2005/Atom")];
$entry
}
The following version is more portable:
let $entry := <entry xmlns="http://www.w3.org/2005/Atom">
<id>urn:uuid:1234</id>
<updated>2012-01-20T11:30:11-05:00</updated>
<published>2011-12-29T15:44:11-05:00</published>
<link href="?id=urn:uuid:1234" rel="edit" type="application/atom+xml"/>
<title>Title</title>
<category scheme="http://uri/categories" term="category"/>
<fake:fake xmlns:fake="http://fake/" attr="val"/>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<p>Blah</p>
</div>
</content>
</entry>
return
copy $new-entry := $entry
modify (delete nodes $new-entry//*[not(namespace-uri(.) = "http://www.w3.org/2005/Atom")])
return $new-entry

Answer 2

Sort of a round-about way of doing it but this ended up working:
declare default element namespace "http://www.w3.org/2005/Atom";
<feed>
<title>All Posts</title>
{
for $entry in collection('/db/entries')/entry
return
element{node-name($entry)}{
$entry/#*,
for $child in $entry//*[namespace-uri(.) = "http://www.w3.org/2005/Atom"]
return $child
}
}
</feed>
Waiting for the time limit to expire and then I'll accept it as an answer.