Issue #2416983 by Dave Reid: Added hook_xmlsitemap_rebuild_clear().

xmlsitemap.api.php

@@ -113,6 +113,20 @@ function hook_xmlsitemap_link_update(array $link, array $context) {
     ->execute();
 }
 
+/**
+ * Respond to XML sitemap link clearing and rebuilding.
+ *
+ * @param array $types
+ *   An array of link types that are being rebuilt.
+ * @param bool $save_custom
+ *   If links with overridden status and/or priority are being removed or not.
+ */
+function hook_xmlsitemap_rebuild_clear(array $types, $save_custom) {
+  db_delete('mytable')
+    ->condition('link_type', $types, 'IN')
+    ->execute();
+}
+
 /**
  * Index links for the XML sitemaps.
  */

xmlsitemap.generate.inc

@@ -424,6 +424,9 @@ function xmlsitemap_batch_variable_set(array $variables) {
  */
 function xmlsitemap_rebuild_batch_clear(array $entities, $save_custom, &$context) {
   if (!empty($entities)) {
+    // Let other modules respond to the rebuild clearing.
+    module_invoke_all('xmlsitemap_rebuild_clear', $entities, $save_custom);
+
     $query = db_delete('xmlsitemap');
     $query->condition('type', $entities);