source: trunk/www.guidonia.net/wp/wp-includes/feed-rss2.php@ 44

<?php
/**
 * RSS2 Feed Template for displaying RSS2 Posts feed.
 *
 * @package WordPress
 */

header('Content-Type: ' . feed_content_type('rss-http') . '; charset=' . get_option('blog_charset'), true);
$more = 1;

echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>

<rss version="2.0"
        xmlns:content="http://purl.org/rss/1.0/modules/content/"
        xmlns:wfw="http://wellformedweb.org/CommentAPI/"
        xmlns:dc="http://purl.org/dc/elements/1.1/"
        xmlns:atom="http://www.w3.org/2005/Atom"
        xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
        xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
        <?php do_action('rss2_ns'); ?>
>

<channel>
        <title><?php bloginfo_rss('name'); wp_title_rss(); ?></title>
        <atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
        <link><?php bloginfo_rss('url') ?></link>
        <description><?php bloginfo_rss("description") ?></description>
        <lastBuildDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></lastBuildDate>
        <?php the_generator( 'rss2' ); ?>
        <language><?php echo get_option('rss_language'); ?></language>
        <sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
        <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
        <?php do_action('rss2_head'); ?>
        <?php while( have_posts()) : the_post(); ?>
        <item>
                <title><?php the_title_rss() ?></title>
                <link><?php the_permalink_rss() ?></link>
                <comments><?php comments_link(); ?></comments>
                <pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
                <dc:creator><?php the_author() ?></dc:creator>
                <?php the_category_rss() ?>

                <guid isPermaLink="false"><?php the_guid(); ?></guid>
<?php if (get_option('rss_use_excerpt')) : ?>
                <description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
<?php else : ?>
                <description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
        <?php if ( strlen( $post->post_content ) > 0 ) : ?>
                <content:encoded><![CDATA[<?php the_content() ?>]]></content:encoded>
        <?php else : ?>
                <content:encoded><![CDATA[<?php the_excerpt_rss() ?>]]></content:encoded>
        <?php endif; ?>
<?php endif; ?>
                <wfw:commentRss><?php echo get_post_comments_feed_link(); ?></wfw:commentRss>
                <slash:comments><?php echo get_comments_number(); ?></slash:comments>
<?php rss_enclosure(); ?>
        <?php do_action('rss2_item'); ?>
        </item>
        <?php endwhile; ?>
</channel>
</rss>