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This is a technical description of the 2.x branch of the module. For the newer 3.x branch see this article; for 4.x, see this article.

New features of Simple XML sitemap

Version 2.10 of Simple XML sitemap is mainly a feature release with only a few minor bugs fixed. The new features are

• the implementation of the changefreq parameter
• the ability to set an interval at which to regenerate the sitemap
• the ability to customize XML output
• the ability to add arbitrary links to the sitemap
• image indexation

See the 8.x-2.10 release page for details.
A new version has been released, please make sure to visit the project page.

Image indexation

Simple XML sitemap is now able to create Google image sitemaps through indexing all images attached to entities. This includes images uploaded through the image field as well as inline images uploaded through the WYSIWYG. The inclusion of images can be set at the entity type and bundle level but can be overridden on a per-entity basis giving you all the flexibility.

Please bear in mind, that all images attached to entities get indexed regardless of their file system location (public/private). Another thing worth noting is that the original images get indexed, not the derived styles. This should be considered before indexing entities with many high resolution images which could increase traffic.

Indexation of custom link images has not made it into this release, but the feature is already available in the development version of the module.

Adding arbitrary links to the sitemap

Most use cases dictate the inclusion of internal links which can be achieved through adding entity links to the index. For non-entity pages like views, there has been the possibility to add custom links through the UI or the API. In both cases however the system only allows internal links which are accessible to anonymous users. The new version of the module provides a way to add any link to the index, even ones Drupal does not know about:

/**
 * Use this hook to add arbitrary links to the sitemap.
 *
 * @param array &$arbitrary_links
 */
function hook_simple_sitemap_arbitrary_links_alter(&$arbitrary_links) {
 
  // Add an arbitrary link.
  $arbitrary_links[] = [
    'url' => 'http://example.com',
    'priority' => '0.5',
    'lastmod' => '2012-10-12T17:40:30+02:00',
    'changefreq' => 'weekly',
    'images' => [
      ['path' =>'http://path-to-image.png']
    ]
  ];
}

As the example shows, all properties of the link like priority/lastmod/changefreq can be defined as well.

To alter links shortly before they get transformed to XML output, there is still the possibility to use the following:

/**
 * Alter the generated link data before the sitemap is saved.
 * This hook gets invoked for every sitemap chunk generated.
 *
 * @param array &$links
 *   Array containing multilingual links generated for each path to be indexed.
 */
function hook_simple_sitemap_links_alter(&$links) {
 
  // Remove German URL for a certain path in the hreflang sitemap.
  foreach ($links as $key => $link) {
    if ($link['path'] === 'node/1') {
      // Remove 'loc' URL if it points to a german site.
      if ($link['langcode'] === 'de') {
        unset($links[$key]);
      }
      // If this 'loc' URL points to a non-german site, make sure to remove
      // its german alternate URL.
      else {
        if ($link['alternate_urls']['de']) {
          unset($links[$key]['alternate_urls']['de']);
        }
      }
    }
  }
}

Basic alteration of the XML output

The following two new hooks can now be used to alter the XML output:

/**
 * Alters the sitemap attributes shortly before XML document generation.
 * Attributes can be added, changed and removed.
 *
 * @param array &$attributes
 */
function hook_simple_sitemap_attributes_alter(&$attributes) {
 
  // Remove the xhtml attribute e.g. if no xhtml sitemap elements are present.
  unset($attributes['xmlns:xhtml']);
}
 
/**
 * Alters attributes of the sitemap index. shortly before XML document generation.
 * Attributes can be added, changed and removed.
 *
 * @param array &$index_attributes
 */
function hook_simple_sitemap_index_attributes_alter(&$index_attributes) {
 
  // Add some attribute to the sitemap index.
  $index_attributes['name'] = 'value';
}

Other API changes

The API is now more forgiving allowing missing link setting arguments when using some of its inclusion altering methods. Here is en example of the simple_sitemap.generator API in action:

\Drupal::service('simple_sitemap.generator')
  ->saveSetting('remove_duplicates', TRUE)
  ->enableEntityType('node')
  ->setBundleSettings('node', 'page', ['index' => TRUE, 'priority' => 0.5])
  ->removeCustomLinks()
  ->addCustomLink('/some/view/page', ['priority' => 0.5])
  ->generateSitemap();

More documentation can be found here. I hope the new version of this module will be of great use to you!