The Easiest way to access XML structures is via the xml_parse_into_struct() function.

<?php
$data = file_get_contents('thedata.xml');

$x = xml_parser_create();

xml_parser_set_option(
    $x, 
    XML_OPTION_CASE_FOLDING, 
    true
);

xml_parser_set_option(
    $x,
    XML_OPTION_SKIP_WHITE, 
    true
);

xml_parse_into_struct($x, 
                      $data, 
                      $wishlist, 
                      $tags);

xml_parser_free($x);


// Access All Description Elements
$descs = $tags['DESCRIPTION'];
foreach ($descs as $descid) {
    echo $wishlist[$descid]['value'];
    echo "\n<br />\n";
}
?>