--- modules/taxonomy/taxonomy.module.orig	2011-05-25 22:43:55.000000000 +0200
+++ modules/taxonomy/taxonomy.module	2012-03-14 18:46:24.000000000 +0100
@@ -834,6 +834,9 @@
  *   Results are statically cached.
  */
 function taxonomy_get_tree($vid, $parent = 0, $depth = -1, $max_depth = NULL) {
+  if (function_exists('taxonomy_edge_taxonomy_get_tree')) {
+    return taxonomy_edge_taxonomy_get_tree($vid, $parent, $depth, $max_depth);
+  }
   static $children, $parents, $terms;
 
   $depth++;
@@ -1129,6 +1132,9 @@
  *   A resource identifier pointing to the query results.
  */
 function taxonomy_select_nodes($tids = array(), $operator = 'or', $depth = 0, $pager = TRUE, $order = 'n.sticky DESC, n.created DESC') {
+  if (function_exists('taxonomy_edge_taxonomy_select_nodes')) {
+    return taxonomy_edge_taxonomy_select_nodes($tids, $operator, $depth, $pager, $order);
+  }
   if (count($tids) > 0) {
     // For each term ID, generate an array of descendant term IDs to the right depth.
     $descendant_tids = array();