Description:
------------
see
http://jp.php.net/manual/en/simplexmlelement.children.php

Test script:
---------------
<?php
	$a = "<a><b:c xmlns:b='http://www.example.com/'>xyz</b:c></a>";
	$xml = simplexml_load_string($a);

	print_r("1:" . (string)($xml->children("b",false)->c). "\n");

	print_r("2:" . (string)($xml->children("b",true)->c) . "\n");


?>

this correctly outputs:
1: 2:xyz 


Expected result:
----------------
Description of is_prefix should be as follows:

If is_prefix is TRUE, ns will be regarded as a prefix. If FALSE, ns will be regarded as a namespace URL.

Actual result:
--------------
Description of is_prefix is as follows:

If is_prefix is TRUE, ns will be regarded as a namespace URL. If FALSE, ns will be regarded as a prefix.