Allow for nested RSS elements in format_rss_channel

I know that the args() can add a tag, but how to I add a nested tag?
I want to add an image tag to my rss.

I went in an hard coded it before I realized I could do it with args... doh.

What I would really like to see it this...

support for the more prevalent features of rss 2.0, like:
  <pubDate></pubDate> 
  <lastBuildDate></lastBuildDate> 
  <category domain="syndic8"></category> 
  <category></category> 
  <generator></generator> 
  <docs></docs> 
  <ttl></ttl> 
  <image>
    <title></title> 
    <url></url> 
    <link></link> 
    <width></width> 
    <height></height> 
  </image>

args handles everything but the image just fine, or am I missing something here?

I also want these to be generated dynamically from the user's profile so each user can set it themself, so is this something I should submit as an update myself or is there any interest in making this part of the core functionality?

A little recursion will do ya good
proposed changes to handle nested elements

function format_rss_channel($title, $link, $description, $items, $language = "en", $args = array()) {
// arbitrary elements may be added using the $args associative array

$output .= "<channel>\n";
$output .= " <title>". drupal_specialchars(strip_tags($title)) ."</title>\n";
$output .= " <link>". drupal_specialchars(strip_tags($link)) ."</link>\n";
$output .= " <description>". drupal_specialchars($description) ."</description>\n";
$output .= " <language>". drupal_specialchars(strip_tags($language)) ."</language>\n";
// changes added for recursing elements
if (is_array($args)) {
$output .= create_node($args);
}
// end changes
$output .= $items;
$output .= "</channel>\n";

return $output;
}

function create_node($args) {
foreach ($args as $key => $value) {
if (is_array($value)) {
$output .= " <$key>\n". create_node($value) ." </$key>\n";
}
else {
$output .= " <$key>". drupal_specialchars(strip_tags($value)) ."</$key>\n";
}
}
return $output;
}

I am passing new info here from node.module in function node_feed() as follows:
at line 889 of cvs version

// added to support image elements
$rss_image = array("title"=> "SteelePrice.NET", "url"=> "http://steeleprice.net/images/spnet_logo_rss.gif", "link"=> "http://steeleprice.net", "width"=> "88", "height"=> "31");
$rss_args = array("copyright"=> "Copyright ©2003 H. Steele Price, IV, All rights reserved.", "image"=> $rss_image);
$output .= format_rss_channel($channel["title"], $channel["link"], $channel["description"], $items, $channel["language"], $rss_args);
$output .= "</rss>\n";

this results in my XML output looking like this:

- <rss version="0.91">
- <channel>
<title>SteelePrice.NET - trudging the road of happy coding</title>
<link>http://steeleprice.net</link>
<description>Live to code, don't code to live.</description>
<language>en</language>
<copyright>Copyright ©2003 H. Steele Price, IV, All rights reserved.</copyright>
- <image>
<title>SteelePrice.NET</title>
<url>http://steeleprice.net/images/spnet_logo_rss.gif</url>
<link>http://steeleprice.net</link>
<width>88</width>
<height>31</height>
</image>
- <item>

exactly what I wanted.

Yeah, I made an rss module. It was called export. I'll put it in cvs and release as soon as I have nonbroken websites that are mission critical. I'll also put up that other small filter module, I forgot what it was called. But this module will make it easy. Can we assign taxonomy terms to the whole site? There is a category tagh in channel.