How to fix hAtom errors reported in Google Webmaster Tools? - php

Question

Google Webmaster Tools reports a bunch of structured data error: Missing: author, Missing: entry-title and Missing: updated for all my pages. For my posts thoug, it's only Missing: updated.
I'm using WordPres CM with a custom theme based on the Twenty Thirteen theme. Pretty much every thread I've enountered on this issue tells me to edit my single.php file and add the entry-title class to the h1 tag containing the_title. However, my single.php file looks like this:
<?php
/**
* The template for displaying all single posts
*
* #package WordPress
* #subpackage Twenty_Thirteen
* #since Twenty Thirteen 1.0
*/
get_header(); ?>
<div id="primary" class="content-area">
<div id="content" class="site-content" role="main">
<?php /* The loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
<?php get_template_part( 'content', get_post_format() ); ?>
<?php twentythirteen_post_nav(); ?>
<?php comments_template(); ?>
<?php endwhile; ?>
</div><!-- #content -->
</div><!-- #primary -->
<?php get_sidebar(); ?>
<?php get_footer(); ?>
I don't know PHP very well, but I guess that the following line
<?php get_template_part( 'content', get_post_format() ); ?>
means that it's loading the file content.php, which looks like this:
<?php
/**
* The default template for displaying content
*
* Used for both single and index/archive/search.
*
* #package WordPress
* #subpackage Twenty_Thirteen
* #since Twenty Thirteen 1.0
*/
?>
<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<header class="entry-header">
<?php if ( has_post_thumbnail() && ! post_password_required() && ! is_attachment() ) : ?>
<div class="entry-thumbnail">
<?php the_post_thumbnail(); ?>
</div>
<?php endif; ?>
<?php if ( is_single() ) : ?>
<h1 class="entry-title post-title"><?php the_title(); ?></h1>
<?php else : ?>
<h1 class="entry-title post-title">
<?php the_title(); ?>
</h1>
<?php endif; // is_single() ?>
<div class="entry-meta">
<?php twentythirteen_entry_meta(); ?>
<?php edit_post_link( __( 'Edit', 'twentythirteen' ), '<span class="edit-link">', '</span>' ); ?>
</div><!-- .entry-meta -->
</header><!-- .entry-header -->
<?php if ( is_search() ) : // Only display Excerpts for Search ?>
<div class="entry-summary">
<?php the_excerpt(); ?>
</div><!-- .entry-summary -->
<?php else : ?>
<div class="entry-content">
<?php
/* translators: %s: Name of current post */
the_content( sprintf(
__( 'Continue reading %s <span class="meta-nav">→</span>', 'twentythirteen' ),
the_title( '<span class="screen-reader-text">', '</span>', false )
) );
wp_link_pages( array( 'before' => '<div class="page-links"><span class="page-links-title">' . __( 'Pages:', 'twentythirteen' ) . '</span>', 'after' => '</div>', 'link_before' => '<span>', 'link_after' => '</span>' ) );
?>
</div><!-- .entry-content -->
<?php endif; ?>
<footer class="entry-meta">
<?php if ( comments_open() && ! is_single() ) : ?>
<div class="comments-link">
<?php comments_popup_link( '<span class="leave-reply">' . __( 'Leave a comment', 'twentythirteen' ) . '</span>', __( 'One comment so far', 'twentythirteen' ), __( 'View all % comments', 'twentythirteen' ) ); ?>
</div><!-- .comments-link -->
<?php endif; // comments_open() ?>
<?php if ( is_single() && get_the_author_meta( 'description' ) && is_multi_author() ) : ?>
<?php get_template_part( 'author-bio' ); ?>
<?php endif; ?>
</footer><!-- .entry-meta -->
</article><!-- #post -->
I assume this is the key part:
<div class="entry-meta">
<?php twentythirteen_entry_meta(); ?>
<?php edit_post_link( __( 'Edit', 'twentythirteen' ), '<span class="edit-link">', '</span>' ); ?>
</div><!-- .entry-meta -->
where
<?php twentythirteen_entry_meta(); ?>
is calling a function from the functions.php file:
if ( ! function_exists( 'twentythirteen_entry_meta' ) ) :
/**
* Print HTML with meta information for current post: categories, tags, permalink, author, and date.
*
* Create your own twentythirteen_entry_meta() to override in a child theme.
*
* #since Twenty Thirteen 1.0
*/
function twentythirteen_entry_meta() {
if ( is_sticky() && is_home() && ! is_paged() )
echo '<span class="featured-post">' . esc_html__( 'Sticky', 'twentythirteen' ) . '</span>';
if ( ! has_post_format( 'link' ) && 'post' == get_post_type() )
twentythirteen_entry_date();
// Translators: used between list items, there is a space after the comma.
$categories_list = get_the_category_list( __( ', ', 'twentythirteen' ) );
if ( $categories_list ) {
echo '<span class="categories-links">' . $categories_list . '</span>';
}
// Translators: used between list items, there is a space after the comma.
$tag_list = get_the_tag_list( '', __( ', ', 'twentythirteen' ) );
if ( $tag_list ) {
echo '<span class="tags-links">' . $tag_list . '</span>';
}
// Post author
if ( 'post' == get_post_type() ) {
printf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
esc_attr( sprintf( __( 'View all posts by %s', 'twentythirteen' ), get_the_author() ) ),
get_the_author()
);
}
}
endif;
SO, here's the big question:
What do I need to change to fix those structured data errors?
Any help is very much appreciated.