<?php 
$doc = new DOMDocument;

// Мы не хотим возиться с пробелами
$doc->preserveWhiteSpace = false;

$doc->Load('rocid.xml');

$xpath = new DOMXPath($doc);

// Мы начали с корневого элемента
$query = '//rocid/city/name';

$entries = $xpath->query($query);

foreach ($entries as $entry) {
  echo "{$entry->previousSibling->previousSibling->nodeValue},\n" .
       "{$entry->previousSibling->nodeValue}\n".
	   "{$entry->nodeValue}\n";
}

?>

<?xml version="1.0" encoding="Windows-1251" ?>
<rocid>
  <!-- таблица  city -->
    <city>
        <city_id>4400</city_id>
        <country_id>3159</country_id>
        <region_id>4312</region_id>
        <name>Москва</name>
    </city>
    <city>
        <city_id>4313</city_id>
        <country_id>3159</country_id>
        <region_id>4312</region_id>
        <name>Абрамцево</name>
    </city>
    <city>
        <city_id>4314</city_id>
        <country_id>3159</country_id>
        <region_id>4312</region_id>
        <name>Алабино</name>
    </city>
</rocid>