XML simpleDOM sortedXPath - 如何选择和显示父属性

xml 文件 ：

<?xml version='1.0' encoding='utf-8'?>
<MyName>
<EventGroup Name="Japan Shows" ID="341">
  <Event Name="Sapporo" ID="40163" StartTime="07/07/12 06:00:00" />
  <Event Name="Consadole" ID="5106" StartTime="07/07/12 07:30:00" />
  <Event Name="Albirex" ID="4063" StartTime="07/07/12 05:20:00" />
  <Event Name="Niigata" ID="1144" StartTime="07/07/12 09:00:00" />
</EventGroup>
<EventGroup Name="USA Shows" ID="342">
  <Event Name="Phoenix" ID="40162" StartTime="07/06/12 09:00:00" />
  <Event Name="California" ID="5105" StartTime="07/08/12 08:30:00" />
  <Event Name="Seattle" ID="4062" StartTime="07/08/12 02:20:00" />
  <Event Name="Chicago" ID="1143" StartTime="07/08/12 04:00:00" />
</EventGroup>
</MyName>

法典：

<?php
include 'SimpleDOM.php';
$xml = simpledom_load_file($cache_file);
$count = 0;
$max = 50;
foreach ($xml->sortedXPath("EventGroup/Event", "@StartTime", SORT_ASC) as $EventGroup => $item) {
$time = date("d/m - H:i", strtotime($item['StartTime']));
$event_name = $item['Name'];
    if ($count < $max) {
        echo "$time";
        echo "$event_name";
    }
    $count++;
}
?>

结果：

07/06 - 09:00 Phoenix
07/07 - 06:00 Sapporo
07/07 - 07:30 Consadole
07/08 - 04:00 Chicago

等。。。这些都是正确的。

但是，如何显示适当的事件组名称呢？如何选择和显示每个事件结果的父名称属性？我想要的结果应该是这样的：

USA Shows   07/06 - 09:00 Phoenix
Japan Shows 07/07 - 06:00 Sapporo
Japan Shows 07/07 - 07:30 Consadole
USA Shows   07/08 - 04:00 Chicago

等。。。

提前感谢任何帮助！