Adding microdata or schema org for breadcrumb SEO in Drupal 7

0 votes

I'm currently a little confused about microdata and schema.org. Is microdata and schema.org the same? I read the Google and Microsoft documentation, but that didn't helped me to get the difference between this two names.

So far I understood this I have produced this HTML code:

<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
 <a href="/" itemprop="url"><span itemprop="title">My Page</span></a>
</span>
<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
 <a href="/cat1" itemprop="url"><span itemprop="title">Category 1</span></a>
</span>
<span itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
 <a href="/cat1/content" itemprop="url"><span itemprop="title">Content</span></a>
</span>

In my opinion too much overhead but okay if the search results look nice. Is it possible to reduce the count of html code?

Also if I don't need that how does the search engines detect two different trails?

My next problem is that I want to apply this format to the drupal breadcrumps. I found on the web this fix which I tried to include to my own SEO module like this:

function mymod_page_alter(&$variables) {
    if (!isset($variables['breadcrumb'])) {
        $variables['breadcrumb'] = theme('my_microdata', array('breadcrumb' => drupal_get_breadcrumb()));
    }
}
function mymod_theme($existing, $type, $theme, $path) {
  return array(
    'my_microdata' => array(
     'variables' => array('breadcrumb' =>array()),
    ),
  );
}
function mymod_menu_breadcrumb_alter(&$active_trail, $item){
  foreach($active_trail as $id=>$active_trail_item){
    $active_trail[$id]['localized_options']['attributes']['itemprop'][]="url";
  }
}
function theme_my_microdata($variables){
 $breadcrumb=$variables['breadcrumb'];
print_r(debug_backtrace());
 $output="*+*+*+*+*";
  if (!empty($breadcrumb)) {
    // Provide a navigational heading to give context for breadcrumb links to
    // screen-reader users. Make the heading invisible with .element-invisible.
    $output = '<h2 class="element-invisible">' . t('You are here') . '</h2>';
    $output .= '<div class="breadcrumb">';
    $separator="";
    foreach($breadcrumb as $breadcrumb_item){
      $output.='<span typeof="datav:Breadcrumb">'.$separator.$breadcrumb_item."</span>";
      $separator="»";
    }
    $output .='</div>';
  }

    return $output."xXxXxXx";
}

So far I checked that all this code is executed. But this theming is not applied on my page. Why does that code not work? Could this been related with the module breadcrumb? I know that this output will be garbage but I cannot see the result.

If I guess right than is the output created by theme.inc line 1682ff theme_breadcrumb(...)instead of my code.

It would be nice if somebody could help me, also if you don’t know all answers of my questions!

Mar 4, 2022 in Digital Marketing by Kichu
• 19,040 points
333 views

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