Problema al recibir string con datos xml

[pateketrueke]

Es extraño, yo intento lo mismo y todo perfecto.

Código PHP:

var_dump(simplexml_load_string('<atom:entry>
<atom:id>id</atom:id>
<wt:crawl-type>web-crawl</wt:crawl-type>
<wt:issue-type>http-error</wt:issue-type>
<wt:url>http://example.com/dir/</wt:url>
<wt:detail>4xx Error</wt:detail>
<wt:linked-from>http://example.com</wt:linked-from>
<wt:date-detected>2008-11-17T01:06:10.000
</wt:date-detected>
</atom:entry>'));
 

Salida:

class SimpleXMLElement#1 (7) {
public $atom:id =>
string(2) "id"
public $wt:crawl-type =>
string(9) "web-crawl"
public $wt:issue-type =>
string(10) "http-error"
public $wt:url =>
string(23) "http://example.com/dir/"
public $wt:detail =>
string(9) "4xx Error"
public $wt:linked-from =>
string(18) "http://example.com"
public $wt:date-detected =>
string(24) "2008-11-17T01:06:10.000
"
}

Yo no veo que desaparezca nada.