phpquery遍历问题

phpQuery::newDocumentFile($xml);
$artlist2=pq('ArticleList');
foreach($artlist2 as $li2){ 
    echo pq($li2)->find('Article')->attr('ID');
}

$xml的结构是下面这样的，只能获取第一个id

---

phpQuery::newDocumentFile($xml);
foreach( pq("AtrticleList") as $articleList ) {
    foreach( pq("Article", $articleList) as $article ) {
        echo pq($article)->attr("ID");
    }
}