Add links programmatically to xmlsitemap

drupal-module-xmlsitemap-custom.php

<?php

/**
 * Implements hook_cron().
 */
function MYMODULE_cron() {
  MYMODULE_xmlsitemap_links();
}

/**
 * Implements hook_xmlsitemap_links
 */
function MYMODULE_xmlsitemap_links() {
  $menu_links = menu_load_links("main-menu");
  $sorted = array();
  foreach ($menu_links as $menu_link) {
    if ($menu_link['link_path'] == '<view>' || $menu_link['hidden'] == 1) { continue; }
    $absolute_weight = $menu_link['weight'];
    if ($absolute_weight < 0) { $absolute_weight += 100; }
    if ($menu_link['depth'] > 1) { $absolute_weight = (($menu_link['depth'] - 1) * 10) + $absolute_weight; }
    $sorted[$absolute_weight] = array(
      'type' => 'MYMODULE',
      'id' => $menu_link['mlid'],
      'loc' => $menu_link['link_path'],
      'lastmod' => time(),
      'changefreq' => 4600,
      'priority' => 0.5,
    );
  }
  ksort($sorted);
  $links = array_values($sorted);
  foreach ($links as $link) {
    xmlsitemap_link_save($link);
  }
}

Great !!! Thanks