ok maybe im missunderstanding this question the anser seems to simple, please get back to me.
<?php
$file = fopen("http://slashdot.org/slashdot.xml", 'r');
while( !feof($file) )
@$buffer .= fread($file, 4096);
?>
there ya go, now $buffer will have all your returned data. just parse it however you like.
Chris Lee
lee@mediawaveonline.com