xpath problem with XML::XPath and LibXML

hi all,
Below is the xml I want to parse with XPath, however, I met some problems  
with both XML::XPath and XML::LibXML;

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom"  
xmlns:db="http://www.douban.com/xmlns/"  
xmlns:gd="http://schemas.google.com/g/2005"
xmlns:opensearch="http://a9.com/-/spec/opensearchrss/1.0/">
<title>friends</title>
<author>
<link href="http://api.douban.com/people/ahbei" rel="self"/>
<link href="http://www.douban.com/people/ahbei/" rel="alternate"/>
<link href="http://t.douban.com/icon/u1000001-14.jpg" rel="icon"/>
<name>ahbei</name>
<uri>http://api.douban.com/people/1000001</uri>
</author>
<opensearch:startIndex>1</opensearch:startIndex>
<opensearch:itemsPerPage>2</opensearch:itemsPerPage>
<opensearch:totalResults>114</opensearch:totalResults>
<entry>
<id>http://api.douban.com/people/1010394</id>
<title>Engo</title>
<link href="http://api.douban.com/people/1010394" rel="self"/>
<link href="http://www.douban.com/people/akin/" rel="alternate"/>
<link href="http://t.douban.com/icon/u1010394-10.jpg" rel="icon"/>
<link href="http://www.halfull.cn" rel="homepage"/>
<content>
http://www.douban.com/group/topic/3750385/
</content>
<db:location id="beijing">beijing</db:location>
<db:uid>akin</db:uid>
</entry>
<entry>
<id>http://api.douban.com/people/1276180</id>
<title>wo</title>
<link href="http://api.douban.com/people/1276180" rel="self"/>
<link href="http://www.douban.com/people/movie007wn/" rel="alternate"/>
<link href="http://t.douban.com/icon/u1276180-40.jpg" rel="icon"/>
<content>
???????????????
</content>
<db:location id="beijing">beijing</db:location>
<db:uid>movie007wn</db:uid>
</entry>
</feed>

Here is the XML::XPath code:

my $xml = XML::XPath->new( xml => $string);
my $nodeset = $xml->findnodes('//entry');
foreach my $node ( $nodeset->get_nodelist){
print $node->findvalue('//title'),"\n";
}

I got
friendsEngowo
friendsEngowo
which are all the title nodes of this xml, it seems like each $node has all  
the information of this XML. Dose any one knows what the problem
is?


Then I try to use XML::LibXML instead, here is the code

my $xml = XML::LibXML->new->parse_string( $string);
my @nodeset = $xml->find('//entry');
print Dumper @nodeset;

I got
$VAR1 = bless( [], 'XML::LibXML::NodeList' );

which means I got nothing, entry nodes for this xml are not found, so can  
anybody help me?

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