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Надо создать такой виходной xml-файл:

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>MY RSS</title>
<link>http://rss.net/</link>
<description>Latest Releases</description>
<language>en-us</language>
<atom:link href="http://rss.net/rss.php?chttp://rss.net/rss.php?cat=1&amp;recache=0%22%25" rel="self" type="application/rss+xml" />

<item>
<title>My first Rss</title>
<link>http://rss.net/get/Universe.torrent</link>
<description><![CDATA[
Category: <a href="http://rss.net/cat/9">ЕЕЕ</a><br />
Subcategory: <a href="http://rss.net/sub/629">Asterisk</a><br />
Size: 48.74&nbsp;megabyte<br />
Ratio: 1 seeds, 0 leechers<br />
Language: <img src="http://mnstat.com./images/flags/us.gif" /> English<br />
Uploaded by: <a href="http://rss.net/user/DarthHater">BSN</a>]]>
</description>
<pubDate>Wed, 14 Sep 2011 15:16:35 +0100</pubDate>
<category>All</category>
<guid isPermaLink='true'>http://rss.net/get/Universe.torrent</guid>
<enclosure url="http://rss.net/get/Uni.torrent" length="51109851" type="application/x-bittorrent" />
</item>
</channel>
</rss>

Я нашол пхп-код, но не для всього, вот:

$xml=new DomDocument('1.0','utf-8');
$channel = $xml->appendChild($xml->createElement('channel'));

$title = $channel->appendChild($xml->createElement('title'));
$link = $channel->appendChild($xml->createElement('link'));
$description = $channel->appendChild($xml->createElement('description'));
$item = $channel->appendChild($xml->createElement('item'));

$title_ch = $item->appendChild($xml->createElement('title'));
$link_ch = $item->appendChild($xml->createElement('link'));
$description_ch = $item->appendChild($xml->createElement('description'));


$title->appendChild($xml->createTextNode('Title_ch'));
$link->appendChild($xml->createTextNode('Link_ch'));
$description->appendChild($xml->createTextNode('Description_ch'));

$title_ch->appendChild($xml->createTextNode('Title'));
$link_ch->appendChild($xml->createTextNode('Link'));
$description_ch->appendChild($xml->createTextNode('Description'));

$xml->formatOutput = true;
$xml->save('rss_user/rss1.xml');

Как создать тег <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">???? И другие теги также