Edit

Edit: feed-atom.php

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

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

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

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', 'atom' );
?>
<feed
	xmlns="http://www.w3.org/2005/Atom"
	xmlns:thr="http://purl.org/syndication/thread/1.0"
	xml:lang="<?php bloginfo_rss( 'language' ); ?>"
	<?php
	/**
	 * Fires at end of the Atom feed root to add namespaces.
	 *
	 * @since 2.0.0
	 */
	do_action( 'atom_ns' );
	?>
>
	<title type="text"><?php wp_title_rss(); ?></title>
	<subtitle type="text"><?php bloginfo_rss( 'description' ); ?></subtitle>

<?php
	/**
	 * Fires just before the first Atom feed entry.
	 *
	 * @since 2.0.0
	 */
	do_action( 'atom_head' );

while ( have_posts() ) :
		the_post();
		?>
	<entry>
		<author>
			<name><?php the_author(); ?></name>
			<?php
			$author_url = get_the_author_meta( 'url' );
			if ( ! empty( $author_url ) ) :
				?>
				<uri><?php the_author_meta( 'url' ); ?></uri>
				<?php
			endif;

/**
			 * Fires at the end of each Atom feed author entry.
			 *
			 * @since 3.2.0
			 */
			do_action( 'atom_author' );
			?>
		</author>

<?php if ( ! get_option( 'rss_use_excerpt' ) ) : ?>
			<content type="<?php html_type_rss(); ?>" xml:base="<?php the_permalink_rss(); ?>"><![CDATA[<?php the_content_feed( 'atom' ); ?>]]></content>
		<?php endif; ?>

<?php
		atom_enclosure();

/**
		 * Fires at the end of each Atom feed item.
		 *
		 * @since 2.0.0
		 */
		do_action( 'atom_entry' );

if ( get_comments_number() || comments_open() ) :
			?>
			<link rel="replies" type="<?php bloginfo_rss( 'html_type' ); ?>" href="<?php the_permalink_rss(); ?>#comments" thr:count="<?php echo get_comments_number(); ?>" />
			<link rel="replies" type="application/atom+xml" href="<?php echo esc_url( get_post_comments_feed_link( 0, 'atom' ) ); ?>" thr:count="<?php echo get_comments_number(); ?>" />
			<thr:total><?php echo get_comments_number(); ?></thr:total>
		<?php endif; ?>
	</entry>
	<?php endwhile; ?>
</feed>

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