如何从php中的rss中检索href

Question

<?xml version='1.0' encoding='UTF-8'?>
<category term="Search"/>
<category term="Design"/>
<title>Ijazilla</title>
<link rel='next' type='application/atom+xml' href='http://www.ijazialla.blogspot.com'/>
?>

我的PHP代码是：

  <?php xml=simplexml_load_file("xmlfile.xml");
    foreach($xml->children() as $child){

       echo $child->title;
       echo $child->category[term];
       echo $child->link[href];

    } ?>

如何检索＆＃34;链接href＆＃34;和两个＆＃34;类别术语＆＃34;？