XPath 查询中的 XPath 查询

如何在 XPatch 查询中启动第二个和第三个 XPatch 查询？
例如

代码板 = http://codepad.viper-7.com/ZhMNGw

网页代码

<div class="entries">                               
    <h3 class="headline" style="position: relative; cursor: pointer;">
        <div>
            <a class="selink" href="/tste/?sd=28726585">  
                <span class="date"> 10:15 </span> 
                <span class="titel">THE TITLE<span class="subtitel">some subtitle</span>
                </span>
            </a>
        </div>                              
    </h3>
</div>  
<div class="entries">                               
    <h3 class="headline" style="position: relative; cursor: pointer;">
        <div>
            <a class="selink" href="/tste/?sd=287265995">  
                <span class="date"> 10:16 </span> 
                <span class="titel">THE TITLE 2<span class="subtitel">some subtitle</span>
                </span>
            </a>
        </div>                              
    </h3>
</div>  

.PHP

libxml_use_internal_errors(true);
$doc = new DOMDocument;
$doc->preserveWhiteSpace = false;
$doc->strictErrorChecking = false;
$doc->recover = true;
$doc->loadHTMLFile('http://domain.com/startpage.php');
$xpath = new DOMXPath($doc);
$query = "//div[@class='entries']"; // <- QUERY ONE
$entries = $xpath->query($query);
$list = array();
$count = 0;
foreach ($entries as $key => $value)
{        
    $list[$count] = array();
    // get the link <- QUERY TWO
    $list[$count]['url'] =  $xpath->query("//a[@class='selink']");
    // get the title but NOT the subtitle <- QUERY THREE
    $list[$count]['title'] = $xpath->query("//span[@class='titel']");

    $count++;
}

print_r($list);