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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 74 | <?php if ( !get_option('rss_use_excerpt') ) : ?> | 
| 75 |           <content type="<?php html_type_rss(); ?>" xml:base="<?php the_permalink_rss() ?>"><![CDATA[<?php the_content_feed('atom') ?>]]></content> | 
| 76 | <?php endif; ?> | 
| 77 |      <?php atom_enclosure(); | 
| 78 |      /** | 
| 79 |       * Fires at the end of each Atom feed item. | 
| 80 |       * | 
| 81 |       * @since 2.0.0 | 
| 82 |       */ | 
| 83 |      do_action( 'atom_entry' ); | 
| 84 |  | 
| 85 |      if ( get_comments_number() || comments_open() ) : | 
| 86 |           ?> | 
| 87 |           <link rel="replies" type="<?php bloginfo_rss('html_type'); ?>" href="<?php the_permalink_rss() ?>#comments" thr:count="<?php echo get_comments_number()?>"/> | 
| 88 |           <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()?>"/> | 
| 89 |           <thr:total><?php echo get_comments_number()?></thr:total> | 
| 90 |      <?php endif; ?> | 
| 91 |      </entry> | 
| 92 |      <?php endwhile ; ?> |