WordPress/wp-includes/feed-rss2-comments.php

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

header( 'Content-Type: ' . feed_content_type( 'rss2' ) . '; charset=' . get_option( 'blog_charset' ), true );

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

/** This action is documented in wp-includes/feed-rss2.php */
do_action( 'rss_tag_pre', 'rss2-comments' );
?>
<rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	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/"
	<?php
	/** This action is documented in wp-includes/feed-rss2.php */
	do_action( 'rss2_ns' );
	?>

	<?php
	/**
	 * Fires at the end of the RSS root to add namespaces.
	 *
	 * @since 2.8.0
	 */
	do_action( 'rss2_comments_ns' );
	?>
>
<channel>
	<title>
	<?php
	if ( is_singular() ) {
		/* translators: Comments feed title. %s: Post title */
		printf( ent2ncr( __( 'Comments on: %s' ) ), get_the_title_rss() );
	} elseif ( is_search() ) {
		/* translators: Comments feed title. 1: Site name, 2: Search query */
		printf( ent2ncr( __( 'Comments for %1$s searching on %2$s' ) ), get_bloginfo_rss( 'name' ), get_search_query() );
	} else {
		/* translators: Comments feed title. %s: Site name */
		printf( ent2ncr( __( 'Comments for %s' ) ), get_wp_title_rss() );
	}
	?>
	</title>
	<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
	<link><?php ( is_single() ) ? the_permalink_rss() : bloginfo_rss( 'url' ); ?></link>
	<description><?php bloginfo_rss( 'description' ); ?></description>
	<lastBuildDate>
	<?php
		$date = get_lastcommentmodified( 'GMT' );
		echo $date ? mysql2date( 'r', $date, false ) : date( 'r' );
	?>
	</lastBuildDate>
	<sy:updatePeriod>
	<?php
		/** This filter is documented in wp-includes/feed-rss2.php */
		echo apply_filters( 'rss_update_period', 'hourly' );
	?>
	</sy:updatePeriod>
	<sy:updateFrequency>
	<?php
		/** This filter is documented in wp-includes/feed-rss2.php */
		echo apply_filters( 'rss_update_frequency', '1' );
	?>
	</sy:updateFrequency>
	<?php
	/**
	 * Fires at the end of the RSS2 comment feed header.
	 *
	 * @since 2.3.0
	 */
	do_action( 'commentsrss2_head' );

	if ( have_comments() ) :
		while ( have_comments() ) :
			the_comment();
			$comment_post = $GLOBALS['post'] = get_post( $comment->comment_post_ID );
			?>
			<item>
				<title>
				<?php
				if ( ! is_singular() ) {
					$title = get_the_title( $comment_post->ID );
					/** This filter is documented in wp-includes/feed.php */
					$title = apply_filters( 'the_title_rss', $title );
					/* translators: Individual comment title. 1: Post title, 2: Comment author name */
					printf( ent2ncr( __( 'Comment on %1$s by %2$s' ) ), $title, get_comment_author_rss() );
				} else {
					/* translators: Comment author title. %s: Comment author name */
					printf( ent2ncr( __( 'By: %s' ) ), get_comment_author_rss() );
				}
				?>
				</title>
				<link><?php comment_link(); ?></link>
		<dc:creator><![CDATA[<?php echo get_comment_author_rss(); ?>]]></dc:creator>
		<pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_comment_time( 'Y-m-d H:i:s', true, false ), false ); ?></pubDate>
		<guid isPermaLink="false"><?php comment_guid(); ?></guid>
		<?php if ( post_password_required( $comment_post ) ) : ?>
		<description><?php echo ent2ncr( __( 'Protected Comments: Please enter your password to view comments.' ) ); ?></description>
		<content:encoded><![CDATA[<?php echo get_the_password_form(); ?>]]></content:encoded>
		<?php else : // post pass ?>
		<description><![CDATA[<?php comment_text_rss(); ?>]]></description>
		<content:encoded><![CDATA[<?php comment_text(); ?>]]></content:encoded>
		<?php
		endif; // post pass
			/**
			 * Fires at the end of each RSS2 comment feed item.
			 *
			 * @since 2.1.0
			 *
			 * @param int $comment->comment_ID The ID of the comment being displayed.
			 * @param int $comment_post->ID    The ID of the post the comment is connected to.
			 */
			do_action( 'commentrss2_item', $comment->comment_ID, $comment_post->ID );
		?>
			</item>
		<?php
		endwhile;
endif;
?>
</channel>
</rss>